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Two opposite point charges of same magnitude separated by distance 2d, electric potential midway between them is?

Two opposite point charges of same magnitude separated by distance 2d, electric potential midway between them is?

Explanation

Let the two charges be:

  • at one end

  • at the other end

  • Distance between them =

  • Midpoint = distance from both charges

The electric potential at a point due to a charge:

So, at the midpoint:

  • Potential due to :

  • Potential due to :
    -frac{kq}{d}