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Q.

Figure shows a potentiometer circuit. The length of the potentiometer wire AB is 120cm and its resistance is 2Ω. The internal resistance of 2V cell is negligible and the internal resistance of 6V cell is 1Ω. Initially the switches S1and S2 are open and S3 is closed

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a

When only S2 is open balanced length l = 20cm

b

When only S1 is open balanced length l = 60cm

c

When all three switches are closed balanced length 60cm

d

When S3 is open, S2 is also open but S1 is closed balance length is 60cm

answer is A.

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Detailed Solution

When only S2 is open,23=(4120)l ⇒l=23×1204=20 cm When only S1 is open, 2=4120×l ⇒ l=60 cm When all three are closed,2=4120×l ⇒ l=60 cm When only S1 is closed, 2=4120×l ⇒ l=60 cm

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