ElectrostaticsHard
Question
A thin, metallic spherical shell contains a charge Q on it. A point charge −q is placed at the centre of the shell and another charge q′ is placed outside it as shown in fig. All the three charges are positive. The force on the charge at the centre is
Options
A.zero
B.towards left
C.towards right
D.upward
Solution
Induced charge on inner surface of shell is distributed uniformly. So electric field due to this charge at centre is zero. The combined electric field due to charge on outer surface of shell and q′ is zero at centre. So net electric field at centre is zero.
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