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. 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. When the potentiometer gives zero deflection, it does not draw any current from the cell or the circuit i.e. Also, VG (or deflection) will be minimum when ℓ is minimum i.e. Physics is a serious subject but sometimes we need a little light relief, take a look at our top 12 physics jokes and as an added bonus we are offering up to 30% off all physics books, use discount code STC314 on the Elsevier store.. 1) What is the name of the first electricity detective? 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. Lechlanche cell, jockey and high resistance. Rheostat – Working. On touching the jockey near to end Y of the potentiometer, the galvanometer pointer again deflects to left but now by a larger amount. The positive of E1 is not connected to terminal X. Principle: If constant current is flowing through a wire of uniform area of cross-section at constant temperature, the potential drop across- any portion of wire is directly proportional to the length of that portion i.e., V ∝ l . (a) The resistance per unit length (R/L) of potentiometer wire. He then shoots and kills Donlin and sets out alone, confident that he will survive longer now that he has all of the water for himself. The connections are made as shown in the circuit diagram. Let’s get to know that in the next section. The battery B 1 connected in circuit is called the driver battery and this circuit is called the primary circuit. ISC Physics Previous Year Question Paper 2010 Solved for Class 12. With the help of sandpaper, remove the insulation from the ends of connecting copper wire. The length of the wire AP 1 = l is measured. ρ= Specific resistance of potentiometer wire. This process is to be done until the galvanometer shows a zero or null deflection. (ii) Now, remove a 2Ω plug from the resistance box so that resistance offered by the resistance box R = 2Ω. The battery B 1 connected in circuit is called the driver battery and this circuit is called the primary circuit. Other details are as follows. A cell holder A jockey A resistance wire mounted on a scale Micrometer screw from CS 261 at Colorado School of Mines Draw an equivalent electric circuit. 6. The diagram below shows a potentiometer set up. (a) The resistance in primary circuit will have to be decreased. The focal length of the lens in 3.0 cm. The relation between potential difference, emf, and internal resistance of a cell is given by. Fig. v1 4Y11 Cambridge IGCSE Physics – past paper questions and answers EXTENSION questions . Candidates are allowed additional 15 minutes for only reading the paper. A potentiometer is said to be more sensitive, if it measures a small potential difference more accurately. A jockey; 1 high resistance box; Sandpaper; 1 Leclanche cell; 1 set square; 1 voltmeter ; Theory. Plus Two Physics Current Electricity Two Mark Questions and Answers. Note the reading on the ammeter. Arrange the required materials on a table and make the connections as per the connection diagram. The focal length of the lens in 3.0 cm. The other end of the galvanometer is connected to a jockey. Physics. Procedure. (E) of the battery and the e.m.fs. This is the most common size and layout of many racetracks located in North America. Fig. Note position of point D (with the help of a set square) to know length AD = l. 4. Other details are as follows. As the cell is in an open circuit, e.m.f. If not, just connect both ends of the wire tightly. Arrange the apparatus as shown in circuit diagram figure. 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) … 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. (i) The specific resistance () of potentiometer wire must be high but its temperature coefficient of resistance () must be low. Method: (i) Initially key K is closed and a potential difference is applied across the wire AB. The sensitivity is inversely proportional to the potential gradient. Bring the jockey in contact with the end A first, and then with C. Note the deflection on the galvanometer. (a) Working Principle of Potentiometer . Using sandpaper clean the ends of the connecting wires and make sure that the connections are … Comparison of emfs of two primary cells: The circuit diagram is shown in the figure. 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 circuit is checked for opposite side deflections. Record note book 10 mark 5 + 5 + 10 = 20 marks. Identify the fault in the circuit and explain, using appropriate equations or otherwise, how it leads to such a one-sided deflection. The terminal B between the gaps is used to connect galvanometer and jockey. This ensures that the circuit connections are correct. The other end of the galvanometer is connected to a jockey. (iv) The potential gradient must remain constant. The diagram below shows a potentiometer set up. 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