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Consider two infinitely large plane parallel conducting plates as shown below. Two plates are uniformly charged with a surface charge density + σ and –2 σ . The force experienced by a point charge +q placed at the mid point between two plates will be :

1. 0 4 q 3 ε σ
2. 0 2 q ε σ
3. 0 2 q 3 ε σ
4. 0 4 q ε σ

Correct answer: 0 2 q 3 ε σ

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