Question

The internal resistance of a cell of emf $2 \,V$ is $0.1 \,\pi$. If it is connected to a resistance of $39\, \pi$, then the voltage across the cell will be (in volts)

• A. 2 V
• B. 0.5 V
• C. 1.95 V
• D. 2.5 V

Answer 1

Answer: (C)

We know $r=\left(\frac{E}{V}-1\right) R$
hence, $R=39 \,\pi, $
$E=2.0 \,V$,
$r=0.1 \,\Omega$
hence, $V=1.95 \,V$