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Q.

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

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a

Both the spheres will have the same charge Q

b

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

c

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

d

Charge on each of the sphere will be 2Q

answer is C.

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Detailed Solution

After the connection of wire, V1 = V2∴Q125=Q220⇒Q1Q2=2520⇒Q1>Q2
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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, and then they are separated. Then