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NEET2005PhysicsElectrostaticsActual

As per the diagram a point charge +q is placed at the origin O . Work done in taking another point charge - Q from the point A [coordinate (0, a) ] to another point B [coordinates (a, 0) ] along the straight path AB is:

Options

  1. Azero
  2. B( q Q 4 ₀ 1 a^2 ) 2 a
  3. C( -q Q 4 ₀ 1 a^2 ) 2 a
  4. D( q Q 4 ₀ 1 a^2 ) a 2

Correct answer

A. zero

Step-by-step solution

Work done is equal to zero because the potential of A and B are the same = 1 4 ₀ q a No work done if a particle does not change its potential energy. i.e. initial potential energy = final potential energy.

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