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The three charges 2 q , q and 2 q are placed at the corners A , B and C of a square of side ‘ a ’ as shown in figure. The magnitude of electric field ( E ) at the corner D of the square is A D C B q/2 q q/2

1. ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + ∈ 2 1 2 1 a 4 q 2 0 π
2. ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + ∈ 2 1 1 a 4 q 2 0 π
3. ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − ∈ 2 1 1 a 4 q 2 0 π
4. ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − ∈ 2 1 2 1 a 4 q 2 0 π

Correct answer: ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + ∈ 2 1 2 1 a 4 q 2 0 π

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