Question

Assertion :The electric Potential and the electric field intensity at the center of a square having fixed point charges at their vertices as shown in figure are zero. Reason: If electric potential at a point is zero then the magnitude of electric field at that point must be zero.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Assertion is incorrect but Reason is correct

Answer 1

The correct option is C Assertion is correct but Reason is incorrect

Electric potential at the center(o) of the square$=k[\frac{q}{r}+[\frac{-q}{r}+[\frac{q}{r}+[\frac{-q}{r}]=0$

The electric field at the center due to positive charges are equal an opposite. So they cancel each other. similarly net electric field due to negative charges is zero. so the total field at the center is zero.

Electric potential at a point is zero does not necessarily represent the electric field at the point is zero.

Ans: (C)