Skip to content

Menu

Game modes

Account

← Physics
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.
Show AnswerHide Answer

Answer

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

Show ExplanationHide Explanation

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.

Sign in to report a question issue

Explore this topic

Which scientist investigated electrostatic forces with a calibrated torsion balance in1785?Evangelista Torricelli is famous for what discovery?Which scientists discovered the empirical relationship in 1911 between the half-life of alpha decay and the energy of…