Question

A current of $2A$ is flowing through a cell of e.m.f . $5V$ and internal resistance $0.5\Omega$ from negative to positive electrode. If the potential of negative electrode is $10V$, the potential of positive electrode will be :-

• A. $5V$
• B. $14V$
• C. $15V$
• D. $16V$

Answer 1

The correct option is B $14V$

Potential drop across internal resistance is $V_r=ir=2\times 0.5=1V$
Potential of positive electrode, $V_{+}=V_{-}+E-V_r=10+5-1=14V$