Plug the key. Method: (i) Initially key K is closed and a potential difference is applied across the wire AB. By sliding the Jockey along the wire, a point of contact P 1 for which the galvanometer shows zero deflection is found. 4.1, a student investigates how the potential difference V across a resistance wire depends upon its length x. 9 Connect the crocodile clips to the resistance wire, 100 centimetres (cm) apart. (i) Set up a circuit as shown in Figure 2 below: Ensure that all connections are tight. Arrange the required materials on a table and make the connections as per the connection diagram. All types of pulley mechanisms consist of some sort of flexible belt (chain, cable, rope, etc.) (b) The radius of potentiometer wire (i.e. (iii) The value of known potential difference must be greater than the value of unknown potential difference to be measured. The circuit diagram for a meter bridge experiment is shown in the attached figure. Determination of internal resistance of potentiometer. Check that the meter bridge wire is connected. The diagram below shows a potentiometer set up On touching the jockey near to the end X of the potentiometer wire, the galvanometer pointer deflects to left On touching the jockey near to end Y of the potentiometer, the galvanometer pointer again deflects to left but - Physics - Current Electricity The diagram below shows a potentiometer set up. Measure the e.m.f. 2Ω standard resistor covered and labelled X, Resistance box, Meter bridge, Galvanometer, Jockey, 2V accumulator or two × 1.5V laclanche cells, Key and connecting wires. Tight the plugs of the resistance box. The battery B 1 connected in circuit is called the driver battery and this circuit is called the primary circuit. Area of cross-section), (c) The specific resistance of the material of potentiometer wire (i.e. XII PHYSICS PRACTICAL MATERIAL (with sample reading & calculations) CIRCUIT DIAGRAM 1 : Before interchanging CIRCUIT DIAGRAM 2 : After interchanging PROCEDURE: 1. On touching the jockey near to end Y of the potentiometer, the galvanometer pointer again deflects to left but now by a larger amount. 2. e), (b) The resistance of rheostat in the primary circuit (i.e. Marks: 70 General Instructions: 1. NECO Physics Practical Questions. It consists of a resistance coil 1 m long with a labelled meter scale in parallel to a known emf source of voltage ε and key K.The resistance coil is connected in parallel to a series combination of the resistance X (device under test) whose value is to be found and a known resistance Y. A meter bridge, galvanometer, one way key, a resistance box, a battery jockey, unknown resistance wire about 1 meter long, screw gauge and connecting wires. One terminal of another cell (whose emf E is to be measured) is connected at one end of the main circuit and the other terminal at any point on the resistive wire through a galvanometer G. This forms the secondary circuit. The jockey should be first touched gently to the left end and then to the right end of the bridge. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students. The connections are made as in the circuit diagram. In applications where variable resistance is required, potentiometers and rheostat are mostly preferred. The answers are provided for all the questions of Chapter 6 Physics of RBSE Class 12. A resistance wire of a battery or eliminator, voltmeter, ammeter, a rheostat, one plug key, connecting wires etc. Potentiometer wire AB has length = 100 cm and resistance 10Ω. Connect the resistance wire in the left gap (between c & d) and resistance box in the right gap. Connect the circuit as shown in the figure. Identify the fault in the circuit and explain, using appropriate equations or otherwise, how it leads to such a one-sided deflection. The sensitivity is inversely proportional to the potential gradient. PHYSICS Foundation Tier Paper 1 8463/1F A F : 2 *02* BLANK PAGE : 3 ... . 6. It is a metal rod with one end as knife edge. A, B, C, and D are four rings on a carbon resistor. 3. Circuit diagram. Physics (042) Sample Question Paper 2018-19 Time allowed: 3 hours. using the principle of wheatstone bridge, describe the method to determine the specific resistance of a wire in the laboratory Draw the circuit diagram and write the formula used - Physics - Current Electricity Plug the key K in place of 2-ohm resistance in the resistance box. J = Jockey. (iv) The potential gradient must remain constant. One terminal of another cell (whose emf E is to be measured) is connected at one end of the main circuit and the other terminal at any point on the resistive wire through a galvanometer G.This forms the secondary circuit. (a) The resistance per unit length (R/L) of potentiometer wire. 5. External Examination marks: 1. On touching the jockey near to the end X of the potentiometer wire, the galvanometer. R = 2 is set in the resistance box. Using the above diagram … Jockey; Ammeter; Connecting wires; Real lab Procedure. (a) The resistance in primary circuit will have to be decreased. Working principle of a Rheostat. (Pointing 0) Note position of point B and measure the distance from the end where the resistance wire is connected to the point B. Take out some resistance from the resistance box , ping the key ‘K’ Touch the jockey gently first at length end & then right end of the bridge wire . Now adjust the value of resistance in the resistance box and slide the jockey along the wire. of two cells and potential difference across a resistor. PHYSICS PRACTICAL HANDBOOK HIGHER SECONDARY SECOND YEAR Prepared by B.ELANGOVAN. Rheostat Circuit Diagram. The other end of the galvanometer is connected to a jockey. Introduce a sufficiently high resistance on the resistance box (H.R). When the jockey is connected at D (AD = x cm), ammeter reading is 0.5 amp. In many ways, it behaves like an electric circuit. Procedure. So on what basis does the rheostat work? When R 2 is shunted by a resistance of 1 0 Ω, balance shifts to 5 0 c m. Find and R 2 in ohms (A B = 1 m): The circuit diagram for a meter bridge experiment is shown in the attached figure. Principle. when jockey is touched near end Y. (i) Initially key K is closed and a potential difference is applied across the wire AB. It is commonly used in school lab experiments with a Wheatstone bridge circuit to find the balance or null point of a circuit. The circuit is checked for opposite side deflections. When AC = 40 cm, no deflection occurs in the galvanometer,find R. Now adjust the value of resistance in the resistance box and slide the jockey along the wire. (i) Measure and record the e.m.f. Also, VG (or deflection) will be minimum when ℓ is minimum i.e. 4. b. Note: The 2020 NECO Practical Physics answers (expo) will be posted here today, 19th November during the NECO Physics Practical exam.Keep checking and reloading this page to know when the answers are posted. With his last bit of strength, Pierson draws a primitive diagram in the sand with his finger (two parallel lines intersected by a perpendicular line), and then dies. In order to understand, the significance of rheostat and its working principle, let us refresh our basic of electric circuits. As the cell is in an open circuit, e.m.f. Science > Physics > Current Electricity > Potentiometer. R = 2 is set in the resistance box. A final means of describing an electric circuit is by use of conventional circuit symbols to provide a schematic diagram of the circuit and its components. With the help of sandpaper, remove the insulation from the ends of connecting copper wire. The potentiometer is a device used to measure the internal resistance of a cell and is used to compare the e.m.f. V ∝l . The diagram below shows a potentiometer set up On touching the jockey near to the end X of the potentiometer wire, the galvanometer pointer deflects to left On touching the jockey near to end Y of the potentiometer, the galvanometer pointer again deflects to left but - Physics - Current Electricity (E) of the battery and the e.m.fs. Extension 1 . (ii) All higher potential points (terminals) of primary and secondary circuits must be connected together at point A and all lower potential points must be connected to point B or jockey. XII-Physics_Vol-1) PRACTICAL.indd 305 04-03-2019 11:06:34 ρ= Specific resistance of potentiometer wire. 7. The point where the jockey is touching the wire is null point D. Choose an appropriate value of 12 from the resistance box such that there is no deflection in the galvanometer when the jockey is nearly in the middle of the wire (i.e.,between 45 cm to 55 cm). The focal length of the lens in 3.0 cm. After inserting the key k, jockey is moved on wire AC till galvanometer shows no deflection (point B). Superiority of potentiometer over voltmeter : An ordinary voltmeter cannot measure the emf accurately because it does draw some current to show the deflection. (b) The length of potentiometer wire will have to be increased so that the length may be measured more accuracy. Important Formulas and procedures to find the values of Unknown Resistance using meter bridge @ Byju's. NECO Practical Physics Questions and Answers. Press the jockey gently at end A … Plus Two Physics Current Electricity Two Mark Questions and Answers. Meter Bridge and Problems on It. If not, just connect both ends of the wire tightly. Physics. Rh), Working of a Potentiometer: Suppose jocky is made to touch a point J on wire then potential difference between A and J will be, At this length (l) two potential difference are obtained, If V > E then current will flow in galvanometer circuit in one direction, If V < E then current will flow in galvanometer circuit in opposite direction. Page 48: 4-4.3 Regeneration Meter Bridge . 3(a) You are provided with cells, a potentionmeter, an ammeter, a voltmeter, a bulb, a key, a jockey and other necessary materials. ----- Answer all questions. Record note book 10 mark 5 + 5 + 10 = 20 marks. Where should the free end of the galvanometer, A potentiometer experiment is setup as shown in fig. Principle of Potentiometer: When a steady current flows through a wire of uniform cross-section the potential difference per unit length of the wire is constant throughout the length of the wire (or p.d. Question 1. Extension 1 . Lechlanche cell, jockey and high resistance. (v) The diameter of potentiometer wire must be uniform everywhere. This process is to be done until the galvanometer shows a zero or null deflection. Download PDF for free. On touching the jockey near to the end X of the potentiometer wire, the galvanometer pointer deflects to left. (i) The specific resistance () of potentiometer wire must be high but its temperature coefficient of resistance () must be low. Note the deflection in the galvanometer. Procedure. Diagram.- Observations:- (2) (3) Experiment — 1 To determine resistance per cm of a given wire by plotting a graph of potential difference versus current. Draw an equivalent electric circuit. The connections are made as shown in the circuit diagram. Diagram.- Observations:- (2) (3) Experiment — 1 To determine resistance per cm of a given wire by plotting a graph of potential difference versus current. The point (J) where the galvanometer wire shows full scale deflection is noted. 1 Draw a diagram to show how 1.5 V cells should be connected together to give a potential difference of 4.5 V. Use the correct circuit symbol for a cell. I'll interpret your term diagram as "any fancy image that captures some physics".. For this I can hardly recommend anything else then MetaPost.It's on par with TeX in being a little hard to learn but once you do master the basics you won't believe you could have ever used anything else (in particular, GIMP and Inkscape; good analogy here would be to TeX vs. MS Word). The diagram below shows a potentiometer set up. Connection of these two forms primary circuit. The focal length of the lens in 3.0 cm. Max. This physics textbook is designed to support my personal teaching activities at Duke University, in particular teaching its Physics 141/142, 151/152, or 161/162 series (Introduc-tory Physics for life science majors, engineers, or potential physics majors, respectively). These solutions are provided by the team of experts and offer the best and accurate solutions to the questions. The voltmeter readingV and the length x of resistance wire are recorded. A meter bridge consists of a wire of length 1 m and of uniform cross-sectional area stretched taut and clamped between two thick metallic strips bent at right angles with two gaps across which resistors are to be connected. This process is to be done until the galvanometer shows a zero or null deflection. It is a metal rod with one end as knife edge. ρ ), (d) The current flowing through potentiometer wire (i), (a) The emf of battery in the primary circuit (i.e. (E 1 and E 2 ) of the cells. Fig. So, (i) Potential gradient directly depends upon. To test the connection, insert the key k 1 and note the ammeter reading. A cell holder A jockey A resistance wire mounted on a scale Micrometer screw from CS 261 at Colorado School of Mines (Hint – water-wheel can be replaced by motor) Answer: Question 2. The diagram is drawn to full scale. across the length l, of the potentiometer wire. This is a jockey- As you can see it's got a metal tip and screwcap where we connect the wire The major use of jockey is in eclectric experiment where we make use of long wire with some resistane as a part . Place jockey in the middle of the wire (between 45cm to 55cm), choose an appropriate value of R from the resistance box such that the galvanometer shows null deflection. 9 shows an object placed 2.0 cm from a thin lens, which is to be used as a magnifying glass. 4-4 S ERVICE ROCEDURES 4-4.1 F LUID EVELS The engine, power steering, and transmission oil levels may be checked by raising the hood. Note position of point D (with the help of a set square) to know length AD = l. The diagram is drawn to full scale. Consider a long resistance wire AB of uniform cross-section. The Jockey … Candidates are allowed additional 15 minutes for only reading the paper. (g) a jockey J and a few connecting wires. a. The jockey is used to slide on the bridge wire. Arrange the required materials on a table and make the connections as per the connection diagram. Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. The four resistances are connected to each other as shown and if the bridge The connections are made as shown in the circuit diagram. To find resistance of a given wire using metre bridge and hence determine the resistivity (specific resistance) of its material. The jockey J is pressed near the ends A and C and if the deflections in the galvanometer are in the opposite directions, then the circuit is correct. ρ= Specific resistance of potentiometer wire. Principle. (ii) Now, remove a 2Ω plug from the resistance box so that resistance offered by the resistance box R = 2Ω. As per definition of emf, it is the potential difference when a cell is in open circuit or no current through the cell. Circuit Diagram. The connections should be according to the diagram shown above. Theory (i) The resistance of resistance wire or a coil is given by \(r=\frac{(100-l)}{l}\cdot R\) where R is the resistance from the resistance box in the left gap, and l is the length of the meter bridge wire from zero ends up to the balance point. Other details are as follows. [2 marks] 13 *13* BLANK PAGE [Turn over] 14 1. Student sheet . For this the current in the primary circuit must remain constant and the jockey must not be slided in contact with the wire. Tight the plugs of the resistance box. There are other tracks of various sizes and we will try and list as many as we can with furlong markers. Record the reading on the ammeter and on the voltmeter . The other end of the galvanometer is connected to a jockey. potentiometer is effectively an ideal instrument of infinite resistance for measuring the potential difference. Consider a long resistance wire AB of uniform cross-section. Meter Bridge. Make all other connection as shown in the circuit diagram . If k is the resistance per unit length of wire AC. When the potentiometer gives zero deflection, it does not draw any current from the cell or the circuit i.e. The leveling screws at the base of TG are adjusted so that the circular turn table is horizontal and the plane of the circular coil is vertical. when jockey is touched near end X. Potentiometer is based on no deflection method. An electric circuit is commonly described with mere words like A light bulb is connected to a D-cell . The investigation will involve linking the decrease of one energy store (or work done) to … By closing key K 1, the cell E 1 is included in the circuit. The length of the wire AP 1 = l is measured. If involved with circuit diagram for Rh = Variable resistance which controls the current through the wire AB. Fig. The jockey is used to slide on the bridge wire. In this article, we shall study the principle, construction, and working of a potentiometer and its uses. 2. +2 PHYSICS PRACTICAL Internal assesssment: 1. This is the most common size and layout of many racetracks located in North America. If both the galvanometer shows null. A resistance wire is introduced in gap S and the resistance box is in gap R. One end of the galvanometer is connected to terminal D and its other end is connected to a jockey. QUESTION 1: (a) Diagram. ISC Physics Previous Year Question Paper 2010 Solved for Class 12. Introduce some resistance in the circuit by taking out some resistance from the resistance box. v1 4Y11 Cambridge IGCSE Physics – past paper questions and answers EXTENSION questions . 5. The galvanometer will show deflection in one direction. Circuit diagram XII-Physics_Vol-1) PRACTICAL.indd 308 04-03-2019 11:06:39. Connect the circuit as shown in the diagram above. Circuit diagram AB- Potentio meter f 10m wire, Bt — Battery eliminator, Kl — single way key, Rh — rheostat , J- Jockey, G- galvanometer, HR- High resistance, K 2 and K 3 two way key, El and E2 — primary cells Observation Tabular column Balancing length when E2is connected (12) … Trailer Jockey Operators Handbook • Change oil in transmission • Change air dryer cartridge • Change brake linings • Clean aftertreatment diesel particulate filter. K = Key. Next, I will set the power pack on the lowest voltage possible to ensure that the current passing through the circuit isn't too high (which could potentially affect the results because the wire would get too hot). GCSE Physics required practical activity 1: Specific heat capacity . So, VG (or deflection) will be maximum when ℓ is maximum i.e. A jockey; 1 high resistance box; Sandpaper; 1 Leclanche cell; 1 set square; 1 voltmeter ; Theory. This ensures that the circuit connections are correct. Therefore voltmeter can only measure terminal voltage of a give n cell. The jockey is adjusted till galvanometer shows no deflection. Remove the insulation from the ends of the connecting copper wires with a sand paper. (i) The sensitivity of potentiometer is assessed by its potential gradient. 9 The terminal B between the gaps is used to connect galvanometer and jockey. Figure below shows a diagram of a water circuit. 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