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MHT CET202211 Aug 2022Morning ShiftPhysicsElectrostaticsActual

Three charges Q,+q and +q are placed at the vertices of right-angle triangle as shown. The net electrostatic energy of the configuration is zero. The value of Q is

Options

  1. A-2 q
  2. B- q 1+ 2
  3. C+q
  4. D- 2 q 2 +1

Correct answer

D. - 2 q 2 +1

Step-by-step solution

The potential energy of the system can be written pair-wise as follows: aligned & U= k Q q l + k q q l + k Q q 2 l =0 & Q=- 2 q 2 +1 aligned

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