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Two insulated charged spheres of radii 20 cm and 25 cm respectively and having an equal charge Q are connected by a copper wire, then they are separated

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Both the spheres will have the same charge Q.

Charge on the 20 cm sphere will be greater than that on the 25 cm sphere.

Charge on the 25 cm sphere will be greater than that on the 20 cm sphere.

Charge on each of the sphere will be 2Q.

answer is C.

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Detailed Solution

After the connection of wire, their potential will be the same.

I.e. $V_{1} = V_{2}$

$∴ \frac{Q_{1}}{25} = \frac{Q_{2}}{20} \Rightarrow \frac{Q_{1}}{Q_{2}} = \frac{25}{20} \Rightarrow Q_{1} > Q_{2}$

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