A metal sphere is placed on an insulating stand. A negatively charged rod is brought close to it. If the sphere is earthed and the rod is taken away, what will be the charge on the sphere?
The sphere will remain neutral.
The sphere will have a net negative charge.
The sphere will have a net positive charge.
The sphere will become polarized
Explanation
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It is given in the question that a metal sphere is kept on an insulating stand. It is initially brought near to a negatively charged conducting rod.
We know that opposite charges repel each other. Since the rod is negatively charged it induces a positive charge accumulation on the nearby surface of the sphere.
But by the law of conservation of charge, the total charge of the sphere must be zero. It means that an equal amount of negative charge is induced on the other side of the sphere.
