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The radii of two charged metal spheres are 5cm and 10cm both having the same charge 60mC. If they are connected by a wire

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A charge of 20mC flows through the wire from smaller to larger sphere

A charge of 40mC flows through the wire from smaller to larger sphere

A charge of 20mC flows through the wire from larger to smaller sphere

No charge flows through the wire because both spheres have same charge.

answer is B.

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Detailed Solution

V = constant and $Q \propto R$

total charge 120 mc will be distributed 5:10 ratio or 1:2 ratio

$\frac{120}{3} \times 1 = 40 a n d \frac{120}{3} \times 2 = 80$

Hence a charge of 20 mc will flow from smaller to bigger sphere

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