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GK QUESTION#3087

Assertion (A): A compass needle can deflect when current flows in a nearby wire. Reason (R): The current produces a magnetic field that interacts with the needle.

  1. ABoth A and R are true, and R is the correct explanation of A.Correct answer
  2. BBoth A and R are true, but R is not the correct explanation of A.
  3. CA is true, but R is false.
  4. DA is false, but R is true.
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Answer

A. Both A and R are true, and R is the correct explanation of A.

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Explanation

A current in a nearby wire produces a magnetic field, which can exert a torque on a compass needle and deflect it. Ørsted observed this connection in 1820. The magnetic field explains the deflection; the date identifies the historical observation.

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