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How charge 4 μc should be split in two parts so that when kept at a fixed distance, force between them is maximum

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How charge 4 μc should be split in two parts so that when kept at a fixed distance, force between them is maximum

(a) 3μC, 2μC

(b) 2μC, 2µC

(c) 1uC, 2μC

(d) 5µC, 2µC

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Correct option is (b) 2μC, 2µC

For maximum force, df/dq = 0

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