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Assertion (A): Field mills are used to issue lightning warnings before any flash occurs.
Reason (R): They detect the rising surface field as charge accumulates overhead.

  • A.Both A and R are true, but R is not the correct explanation of A
  • B.A is true but R is false
  • C.A is false but R is true
  • D.Both A and R are true, and R is the correct explanation of A

Answer: D

Both are true and the reason gives the anticipation, and this is why they are installed at rocket launch facilities. Detection networks by contrast report only flashes that have already happened. Anticipation is what makes the field mill valuable.

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