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Q.

In the given circuit, the reading of ideal voltmeter is E/2. The internal resistance of the battery is 

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a

25 Ω

b

52 Ω

c

23 Ω

d

1 Ω

answer is A.

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Detailed Solution

ε2=ε−ir        or    i=ε2r.................(i)

2ε=i(3+r)...................(ii)

r=1  Ω

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