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  4. Four metal conductors having different shapes a) a sphere b) cylindrical c) pear d) Lightening conductor are mounted on insulating stands and charged. The one which is best suited to retain the charge for a longer time is

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Q. Four metal conductors having different shapes
a) a sphere
b) cylindrical
c) pear
d) Lightening conductor
are mounted on insulating stands and charged. The one which is best suited to retain the charge for a longer time is

KCETKCET 2005Electrostatic Potential and Capacitance

Solution:

The sphere will retain the charge for longer time, because in case of spherical metal conductor, the charge quickly spreads uniformly over the entire surface.