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Three charged particles A , B and C with charges - 4 q , 2 q and - 2 q are present on the circumference of a circle of radius d . The charged particles A , C and centre O of the circle formed an equilateral triangle as shown in the figure. The electric field at the point O is

Options

  1. A3 q π ε 0 d 2
  2. B2 3 q π ε 0 d 2
  3. C3 q 4 π ε 0 d 2
  4. D3 3 q 4 π ε 0 d 2

Correct answer

A. 3 q π ε 0 d 2

Step-by-step solution

E n e t = 4 k q d 2 × 2 c o s 30 ° = q 3 π ε 0 d 2

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