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Q.

A storage battery is connected to a charger for charging with a voltage of 12.5 volts. The internal resistance of the storage battery is 1 Ω When the charging current is 0.5 A, the emf of the storage battery is

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a

13 volts

b

12.5 volts

c

12 volts

d

11.5 volts

answer is C.

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Detailed Solution

V=ε+ir ⇒ 12.5 = ε+ 12 1 ⇒  ε=12 V(As the battery is a storage battery it is getting charged)
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