Physics Electrostatics PMDC 2021
PMDC Verified Question 91 of 131
Q.118 Work on charge is equipotential surface is
A
+ve
B
-ve
C
Zero
D
None
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Zero
1. Concept:

An equipotential surface is a region in space where every single geometric point has the exact same voltage.

2. Formula:

$$ W = q \Delta V $$

3. Solution:

  • Because the surface has identical voltage everywhere, the difference between any point A and point B is strictly zero (\( \Delta V = V_B - V_A = 0 \)).


  • Therefore, \( W = q \times 0 = 0 \). No net work is done moving across it.


4. Why other options are incorrect:

Positive or negative work requires moving a charge up or down a potential gradient, which does not exist along the surface.

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