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In the circuit, the galvanometer G shows...

In the circuit, the galvanometer G shows zero deflection. If the batteries A and b have negligible internal resistance, the value of the resistor R will be -

A

`1000 Omega`

B

`500 Omega`

C

`100 Omega`

D

`200 Omega`

Text Solution

Verified by Experts

The correct Answer is:
C
Current through `R` is `12//(500 + R)`
voltage across `R` is `(12 R)/(500 + R)`
Since galvanometer shows zero deflection, so
`(12 R)/(500 + R) = 2` or `R = 100 Omega`
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