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A charge of 1 \( \mu \)C is taken round a closed path in a static field. The work done is

  • A.proportional to the area enclosed by the path
  • B.proportional to the length of the path
  • C.zero
  • D.the charge multiplied by the greatest potential reached on the path

Answer: C

A static field is conservative, so the potential returns to its starting value and no net work is done however long or convoluted the path. The same is not true when a changing magnetic flux threads the path, which is Faraday's law.

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