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KCET2022PhysicsElectrostatics

Four charges +q,+2 q,+q and -2 q are placed at the corners of a square A B C D respectively. The force on a unit positive charge kept at the centre O is

Options

  1. Aalong the diagonal B D
  2. Balong the diagonal A C
  3. Cperpendicular to A D
  4. Dzero

Correct answer

A. along the diagonal B D

Step-by-step solution

The given situation is shown below Since, charges kept at point A and C are in same magnitude and same nature (i.e. both positive). hence net force due these two charges on unit charge at centre O will be zero. Force due to charge (+2 q) at unit positive charge at centre will be towards B O and also force due to charge (-2 q) at unit positive charge at centre will be towards O D . Therefore, net force on the unit positive charge kept at centre O will be towards B D .

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