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An electric field mill measures

  • A.the charge stored within a thundercloud directly overhead
  • B.the rate of rainfall recorded at the site
  • C.the ambient atmospheric electric field at the surface
  • D.the current in a lightning return stroke

Answer: C

A rotating shutter modulates the field at a sensing plate to give a measurable signal. Field mills are used to warn of imminent lightning risk at launch sites and airfields. They report conditions rather than completed flashes.

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