Question

A cell of e.m.f E and internal resistance r is connected across a resistance r. The potential difference between the terminals of the cell must be

• A. E
• B. E/2
• C. 3E/4
• D. 3E

Answer 1

The correct option is B E/2

Current in circuit$=i=\frac{E}{r+r}=\frac{E}{2r}$

Potential difference across cell$=V=E-ir=E-\frac{E}{2r}r$

$⟹V=\frac{E}{2}$

Answer-(B)