Question

Keeping the resistance constant, potential difference across the ends of the component is decreased to half of the former value. What change will occur with current?

• A. Current remain unchanged
• B. Current is halved
• C. Current becomes one fourth
• D. Current becomes zero

Answer 1

The correct option is B Current is halved

Using ohm's law $I=\frac{V}{R}$ $⟹I\propto V$ ( $\because V=$ constant )

Given : $V^{\prime }=V/2$

$\therefore$ $\frac{I^{\prime }}{I}=\frac{V^{\prime }}{V}=\frac{1}{2}$

Thus current is halved.