Question

Two point charges \(+q\) and \(-q\) are placed at distance \(2a\) apart. The electric field intensity is zero at a point on the axis at distance \(x\) from the midpoint. Then \(x\) is:

• A. \(a\)
• B. \(2a\)
• C. \(a/\sqrt{2}\)
• D. \(\infty\)

Hint:

For an electric dipole, axial field is never zero at finite distance.

Answer 1

The Correct Option is D

For equal and opposite charges, electric fields on the axial line add in the same direction at all finite points. They cancel only at infinity.