1. Tardigrade
  2. Question
  3. Physics
  4. When a magnetic compass needle is carried nearby to a straight wire carrying current, then (I) the straight wire cause a noticeable deflection in the compass needle (II) the alignment of the needle is tangential to an imaginary circle with straight wire as its centre and has a plane perpendicular to the wire

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Q. When a magnetic compass needle is carried nearby to a straight wire carrying current, then
(I) the straight wire cause a noticeable deflection in the compass needle
(II) the alignment of the needle is tangential to an imaginary circle with straight wire as its centre and has a plane perpendicular to the wire

Moving Charges and Magnetism

Solution:

Both points are correct and these are the result of experiments done by Danish physicist Hans Christian Oersted in $1820$