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NEET2012PhysicsElectrostaticsActual

Four point charges -Q,-q, 2 q and 2 Q are placed, one at each corner of the square. The relation between Q and q for which the potential at the centre of the square is zero, is

Options

  1. AQ=-q
  2. BQ=- 1 q
  3. CQ=q
  4. DQ= 1 q

Correct answer

A. Q=-q

Step-by-step solution

If potential at centre is zero, then aligned V₁+V₂+V₃+V₄ & =0 - k Q r - k q r + k 2 Q r + k 2 q r & =0 -Q-q+2 q+2 Q & =0 Q & =-q aligned

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