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Electrostatics: Electric Potential MCQ

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Electric PotentialMediumQuestion 31466

Question

At which point is potential zero for two charges +q at (0,0) and −q at (d,0)?
  1. A
    Midpoint (d/2, 0) only
  2. B
    On the equatorial plane (x = d/2 plane)
    Correct
  3. C
    Everywhere
  4. D
    Only at infinity

Correct answer

On the equatorial plane (x = d/2 plane)

Explanation

V = kq/r₁ + k(−q)/r₂. V = 0 where r₁ = r₂, which is the perpendicular bisector plane (equatorial plane of the dipole). Any point equidistant from both charges.

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