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In the adjoining circuit, the battery E(...

In the adjoining circuit, the battery `E_(1)` has an e.m.f me of 12 volt and zero internal resistance while the battery E has an e.m.f me of 2volt . If the galvanometer G reads zero, then the value of the resistance X in ohm is

A

10

B

100

C

500

D

200

Text Solution

Verified by Experts

The correct Answer is:
B
For zero deflection in galvanometer the potential different across X should be E = 2V
In this condition `(12X)/(500+X)`=2   `therefore`  X=`100Omega`
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