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Q.

Two conducting spheres of radii 5 cm and 10 cm are given a charge of 15μC each. After the two spheres are joined by a conducting wire, the charge on the smaller sphere is 

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a

5 μC

b

15 μC

c

20 μC

d

10 μC

answer is B.

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Detailed Solution

Charge on smaller sphere 

= Total charge r1r1+r2=30 55+10=10μC

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Two conducting spheres of radii 5 cm and 10 cm are given a charge of 15μC each. After the two spheres are joined by a conducting wire, the charge on the smaller sphere is