Question

The internal resistance of a cell of emf $2$V is $0.1\pi$. If it is connected to a resistance of $3.9\pi$, 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

The correct option is C $1.95$V

We know, $r=(\frac{E}{V}-1)R$
hence, $R=3.9\pi ,E=2.0V,r=0.1\Omega$
Hence, $V=1.95$V.