Question

The e.m.f of a cell is $2.0V$ and the internal resistance is $0.1\Omega$. It is connected with a resistance of $3.9\Omega$. Then potential difference across the cell is :-

• A. $0.20V$
• B. $1.90V$
• C. $1.95V$
• D. $2.00V$

Answer 1

The correct option is C $1.95V$

Current in the circuit is $i=\frac{2}{3.9+0.1}=0.5A$
Potential across cell$=$emf of cell$-$ potential across internal resistance $=2-(0.1\times 0.5)=1.95V$