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Q.

When 6 identical cells of negligible internal resistance are connected in series in the secondary circuit of a potentiometer, the balancing length is ‘l’, balancing length becomes l/3 when some cells are connected wrongly, the number of cells connected wrongly are

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a

2

b

1

c

3

d

4

answer is B.

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Detailed Solution

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6Eℓ=(6−2n)E11 Potential gradient is constant
ℓ1ℓ=(6−2n)E6E;ℓ3ℓ=6−2n6
2 = 6 - 2n;2n = 4; n=2

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