Question

The figure given below shows some equipotential surfaces produced by some charges. The magnitude of electric field is greatest at

• A. $\text{C}$
• B. $\text{A}$
• C. same at all points
• D. $\text{B}$

Answer 1

The correct option is D $\text{B}$

Electric lines of forces are always perpendicular to the equipotential surfaces.

$\Rightarrow$ In the figure, it can be observed that near point $\text{B}$ the equipotential surfaces are closely spaced.
Therefore, electric filed lines will be closest at point $\text{B}$ and we know that closest electric lines have higher strength.

$\Rightarrow E_B>E_C>E_A$

$\therefore$ electric field magnitude is greatest at point $\text{B}$.

Tip: In such problems, the key is to observe the spacing of equipotential surfaces.