Electrostatics Question 69

Question: A spherical condenser has inner and outer spheres of radii a and b respectively. The space between the two is filled with air. The difference between the capacities of two condensers formed when outer sphere is earthed and when inner sphere is earthed will be [MP PET 1996]

Options:

A) Zero

B) 4πε0a

C) 4πε0b

D) 4πε0a(bba)

Show Answer

Answer:

Correct Answer: C

Solution:

Capacity when outer sphere is earthed C1=4πε0abba

Capacity when inner sphere is earthed C2=4πε0b+4πε0abba=4πε0(b2ba)

Difference in capacity = C2 ? C1 = 4pe0b



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