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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13 volts

12.5 volts

12 volts

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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