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Q.

Two spheres having radii of 5 cm and 10 cm bear identical charges of 6.6 nC. Find the potentials of spheres after they have been connected by a conductor. Assume that the spheres are at large distance from each other

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a

1200 V

b

600 V

c

396 V

d

792 V

answer is C.

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Detailed Solution

r < R (q1=q2) so charge flows from smaller to bigger until their potential are equal

after they are joined 

q15=q210

q1q2=12 

q1=2q3×1 ;q2=2q3×2

q1=2×6.63nc=4.4 nc

V=14πεo4.45×10-2=9×109×4.4×10−95×10−2=792 V

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