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A conducting shell placed round a charged object shields the outside world because

  • A.the induced charge on the shell cancels the enclosed charge's field beyond it
  • B.the metal absorbs the flux lines and dissipates them as heat
  • C.no field can exist in the space surrounding a conductor
  • D.the shell must be earthed before any shielding occurs at all

Answer: A

Charge of opposite sign is induced on the inner surface and an equal charge of the original sign on the outer, so an earthed shell removes the latter and leaves no external field. Unearthed, the outer charge remains and the field outside is that of the original charge.

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