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JEE Main 2009 Physics question

PhysicsElectric Charges and FieldsJEE Main 2009

A charge is placed at each of the opposite corners of a square. A charge is placed at each of the other two corners. If the net electrical force on is zero, then the equals

Answer: (1)

Solution

For side a: the force on Q from the other Q (along the diagonal) is ; the two q's give a resultant

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Question ID VK-039127