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JEE Main202127 Jul 2021Evening ShiftPhysicsElectrostaticsActual

What will be the magnitude of the electric field at point O as shown in the figure? Each side of the figure is l and perpendicular to the other?

Options

  1. A1 4 π ε 0 q l 2
  2. B1 4 π ε 0 q 2 l 2 ( 2 2 - 1 )
  3. Cq 4 π ε 0 ( 2 l ) 2
  4. D1 4 π ε 0 2 q 2 l 2 ( 2 )

Correct answer

B. 1 4 π ε 0 q 2 l 2 ( 2 2 - 1 )

Step-by-step solution

E 1 = k q l 2 = E 2 E 3 = k q ( 2 ℓ l = k q 2 l 2 E = 2 k q l 2 - k q 2 l 2 = k q 2 l 2 ( 2 2 - 1 )

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