Electrostatics Question 430

Question: A spherical conductor of radius 2m is charged to a potential of 120 V. It is now placed inside another hollow spherical conductor of radius 6m. Calculate the potential to which the bigger sphere would be raised [KCET 2001]

Options:

A) 20 V

B) 60 V

C) 80 V

D) 40 V

Show Answer

Answer:

Correct Answer: D

Solution:

If charge acquired by the smaller sphere is Q then it’s potential $ 120=\frac{kQ}{2} $ ….. (i) Also potential of the outer sphere $ V=\frac{kQ}{6} $ …..(ii) From equation (i) and (ii) V = 40 volt



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