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Two batteries one of the emf 3V, interna...

Two batteries one of the emf 3V, internal resistance 1 ohm and the other of emf 15 V , internal resistance 2 ohm are connected in series with a resistance R as shown . If the potential difference between a and b is zero the resistance of R in ohm is

A

5

B

7

C

3

D

1

Text Solution

Verified by Experts

The correct Answer is:
C
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