A point charge of magnitude Q is placed inside an ungrounded hollow metal sphere

Question

A point charge of magnitude Q is placed inside an ungrounded hollow metal sphere. Two students are arguing about the field external to the sphere: Robin: "The electric field in the metallic shell is zero, since it is a conductor and the charge inside is screened. Thus the electric field outside the sphere will be zero." Francis: "If I draw a Gaussian surface outside the shell, it contains a net charge Q. Thus the field outside cannot be zero." State if each one is correct or incorrect, and explain in detail the flaw in any incorrect argument.

Explanation / Answer

ans: correct becoz The electric field in the metallic shell is zero

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