Question

This is a long answer type question plz answer it in that way.


(a) State the principle of working of a potentiometer.
(b) In the following potentiometer circuit AB is a uniform wire of length 1 m and resistance10 2 Ω.

Calculate the potential gradient along the wire and balance length AO (= l).
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Answer 1

Answer:

i) When a constant current flows through a wire of uniform cross section the fall of potential is directly proportional to the length of wire .

(ii) Total resistance of primary circuit =15 + 10 =25Ω

Current in wire AB,I=2/25=.08A

P.D . across wire =.08 × 10 = 0.8V

Potertial gradient =0.8/100=0.008Vcm−1

Resistance of secondary circuit =1.2+0.3=1.5Ω

Current I = 1.5/1.5=1A

Current in 0.3 Ω resistor = 1A

P.D. across 0.3Ω resistor = 0.3 V

Length AO=0.3V/0.008=37.5cm

Explanation:

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