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# 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 $\;q_{1}\;$ is placed outside it as shown in figure . All the three charges are +ve . The force on the charge at centre is

$(a)\;towards\;left\qquad(b)\;towards\;right\qquad(c)\;zero\qquad(d)\;None\;of\;these$

Explanation :
Charges on the outer surface of sphere will arrange in such a way that due external charges there is no force on inner charges.
But the force due to charge on inner surface of sphere is zero . Therfore $F_{net}\;$ on q is zero
edited Feb 13, 2014 by yamini.v