PHYSICS

Paper – 2

(PRACTICAL)

Answer all questions.

You should not spend more than one and a half hours on Question 1.

Question 1       [9]
This experiment is based on the principle of a potentiometer.

You are provided with:
(a) a 100 cm long and uniform metallic wire AB fitted on a wooden board across a meter scale and provided with binding terminals at each end.
(b) a resistance box R having a range of 1Ω to (at least) 10 Ω.
(c) a 2V dc source (an accumulator or an electronic battery). It is labelled as D.
(d) a freshly dry cell. It is kept either in a battery holder or a battery box. It is labelled as E.
(e) a central zero galvanometer G.
(f) a plug key K.
(g) a jockey J and a few connecting wires.
(i) Set up a circuit as shown in Figure 2 below:

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