Physics · Electrostatic Potential

If the electrostatic potential at a distance \( r \) from a point charge is \( V \), then the work done by an external agency in slowly bringing a test charge \( q_0 \) from infinity to that point is equal to:

1. \( \frac{1}{2} q_0 V \) / \( \frac{1}{2} q_0 V \)
2. \( -q_0 V \) / \( -q_0 V \)
3. \( q_0 V \) / \( q_0 V \)
4. \( q_0 V^2 \) / \( q_0 V^2 \)