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Q.

When a potentiometer is connected between the points A and B as shown in the circuit, balance point is obtained at 64 cm. When it is connected between A and C, the balance point is 8 cm. If the potentiometer is connected between B and C the balance point will be
 

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a

56cm

b

64cm

c

8cm

d

72cm

answer is B.

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Detailed Solution

Potential difference V=kl where k= potential gradient.

V1=kl1=64k

V1-V2=8k

64k−kl2=8k64−l2=8⇒l2=64−8=56cm

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