point charges qA = 2 μC, qB = −5 μC, qC = 2 μC, and qD = −5 μC are located at the corners of a square ABCD of side 10 cm. What is the force on a charge of 2 μC placed at the centre of the square?
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Answer:
no force is applied on the charge kept at the centre of the square.
Explanation:
A and C are at the opposite corners and both have the same charge and both are equidistant form the centre of the square. So they cancel each other's effect.
Similar is the case with B and D.
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