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BITSAT2020PhysicsElectrostaticsActual

Three charge q, Q and 4q are placed in a straight line of length l at points distant 0, 1 2 and l respectively from one end. In order to make the net froce on q zero, the charge Q must be equal to

Options

  1. A- q
  2. B-2 q
  3. C- q 2
  4. Dq

Correct answer

A. - q

Step-by-step solution

( F _ net )_ q =0 k Qq ( 2 )² + k 4 q ² ² =0 array l where k = 1 4 ₀ 4 Qq +4 q ²=0 Q =- q array

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