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NEET2011PhysicsElectrostaticsActual

Four electric charges +q,+q,-q and -q are placed at the corners of a square of side 2 ~L (see figure). The electric potential at point A , mid-way between the two charges +q and +q , is

Options

  1. A1 4 ₀ 2 q L (1+ 1 5 )
  2. B1 4 ₀ 2 q L (1- 1 5 )
  3. Czero
  4. D1 4 ₀ 2 q L (1+ 5 )

Correct answer

B. 1 4 ₀ 2 q L (1- 1 5 )

Step-by-step solution

V= 1 4 ₀ q r Here, aligned & V=2 V_ + ve +2 V_ -ve & V= 1 4 ₀ [ 2 q L - 2 q L 5 ] & V= 2 q 4 ₀ L (1- 1 5 ) aligned

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