Question

The potential difference across the terminals of a battery is $50V$ when $11A$ are drawn and $60V$ when $1A$ is drawn. The emf and the internal resistance of the battery are

• A. 62V;2$\Omega$
• B. 63V;1$\Omega$
• C. 61V;1$\Omega$
• D. 64V;2$\Omega$

Answer 1

Answer: (C)

61V;1$\Omega$

$\Rightarrow E-11r=50$
$E-r=60$
$\Rightarrow 10r=10$
$r=1\Omega$
$E=61V$