Electric Potential Due to a Solid Sphere of Charge
A large condu...
Question
A large conducting sphere of radius r, having a charge Q is placed in contact with a small neutral conducting sphere of radius r′ and is then separated. The charge on smaller sphere will now be:
A
Q(r+r′)r
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B
Q(r−r′)r′
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C
Qrr′+r
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D
Qr′r′+r
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Solution
The correct option is DQr′r′+r Charges will be redistributed when both spheres are placed in contact with each other, such that common potential is achieved.
Charges are distributed in ratio of capacitance. Let Q′1 and Q′2 be the charges of bigger and smaller spheres, respectively.
∵V1=V2
∴Q′1C1=Q′2C2
⇒Q′1Q′2=C1C2=rr′(∵C=4πϵ0r)
⇒Q′1Q′2+1=rr′+1
∴Q′1+Q′2Q′2=r+r′r′......(1)
From conservation of charge on system of two spheres,