Question

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 $1\Omega$. When the charging current is $0.5A$, the emf of the storage battery is

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

Answer 1

Answer: (C)

$V=\epsilon +i(r)$
$\Rightarrow 12.5=\epsilon +\frac{1}{2}(1)$
$\Rightarrow \epsilon =12V$
(As the battery is a storage battery it is getting charged)