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Question

A charge of $4 \,\mu \mathrm{C}$ is to be divided into two. The distance between the two divided charges is constant. The magnitude of the divided charges so that the force between them is maximum, will be :

$1 \,\mu \mathrm{C}$ and $3 \,\mu\mathrm{C}$
$2 \,\mu \mathrm{C}$ and $2\, \mu \mathrm{C}$
0 and $4\, \mu\, \mathrm{C}$
$1.5 \,\mu \mathrm{C}$ and $2.5\, \mu \mathrm{C}$

Solution

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