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

Options

A. 13 volts
B. 12.5 volts
C. 12 volts
D. 11.5 volts

Answer

C

Explanation

(c ) `V = epsilon + i(r ) implies 12.5 = epsilon + (1)/(2) (1) implies epsilon = 12 V`
(As the battery is a storage battery it is getting charged)