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Q.

Two metallic charged spheres whose radii are 20 cm and 10 cm respectively, have each 150 micro-coulomb positive charge. The common potential after they are connected by a conducting wire is

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a

9×106 volts

b

4.5×106 volts

c

1.8×107 volts

d

13.5×106 volts

answer is A.

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Detailed Solution

Common potential V= Total charge  Total capacitance V=150×10−6×24πε010×10−2+20×10−2=9×106V
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