Q.

AB is a wire of uniform resistance. The galvanometer G shows no current when the length AC = 20 cm and CB = 80 cm. The resistance R is equal to

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a

2  Ω

b

8  Ω

c

20  Ω

d

40  Ω

answer is C.

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Detailed Solution

Using balanced condition, R80 =  ACBC = 2080  ⇒   R=20  Ω
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AB is a wire of uniform resistance. The galvanometer G shows no current when the length AC = 20 cm and CB = 80 cm. The resistance R is equal to