A thin, metallic spherical shell contains a charge \( Q \) on it. A point charge \( \mathrm{q} \...

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A thin, metallic spherical shell contains a charge \( Q \) on it. A point charge \( \mathrm{q} \) is placed at the cente of the shell and another charge \( \mathrm{q}_{1} \) is placed outside it as shown in figure. All the three charges are positive. The force on the charge at the centre is
(a) towards left
(b) towards right
(c) upward
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