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MHT CET Physics question

PhysicsElectric Charges and FieldsMHT CET

Four charges equal to are placed at the four corners of a square and a charge q is at its centre. If the system is in equilibrium, the value of q is

Answer: (B)

Solution

On one corner charge the outward repulsion is and the attraction by q (distance ) is for positive q; equating

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Question ID VK-070663