Question

AB is a wire of uniform resistance. The galvanometer G shows zero current when the length AC= 20 cm and
CB = 80 cm. The resistance R is equal to​

Answer 1

okCorrect option is

C

20Ω

As AC+CB=20+80=100cm=1m so it is a meter bridge.

The balance condition for this meter bridge is

80

R

=

100−AC

AC

or

80

R

=

100−20

20

∴R=20Ω

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