一道中学物理题（英文表述）A charged sphere is placed inside a metal container by an insulated thread.The container is earthed .Which of the diagranms shows the distribution of charges correctly?

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一道中学物理题（英文表述）Achargedsphereisplacedinsideametalcontainerbyaninsulatedthread.Thecontainerisearthed.Wh

一道中学物理题（英文表述）A charged sphere is placed inside a metal container by an insulated thread.The container is earthed .Which of the diagranms shows the distribution of charges correctly?
一道中学物理题（英文表述）
A charged sphere is placed inside a metal container by an insulated thread.The container is earthed .Which of the diagranms shows the distribution of charges correctly?

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The answer is A.
Because the container is earthed, its outer surface should be neutral. So B and D are incorrect.
Also the inner surface of the container and the sphere should have opposite electric charge, so C is incorrect.
Therefore, the correct answer is A.

选 A

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