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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(rr)r
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C
Qrr+r
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D
Qrr+r
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Solution

The correct option is D Qrr+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 Q1 and Q2 be the charges of bigger and smaller spheres, respectively.

V1=V2

Q1C1=Q2C2

Q1Q2=C1C2=rr (C=4πϵ0r)

Q1Q2+1=rr+1

Q1+Q2Q2=r+rr ......(1)

From conservation of charge on system of two spheres,

Q1+Q2=Q+0=Q ........(2)

From eqs.(1) and (2)

QQ2=r+rr

Q2=Qrr+r

Hence, option (d) is correct.

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