A simple electric circuit in which a straight copper wire is placed parallel to and over a compass needle. The north pole of the needle of the compass is deflected towards west. How will be the deflection of the north pole of the needle of compass is going to changed if the compass is placed above the wire and the current flows from north to south through the conductor.
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Answer:
Oersted conducted an experiment to study the magnetic effect of electric current. In this experiment he observed the deflections of a compass needle placed in close proximity of an electric wire carrying current. He observed that in the absence of current the needle came to rest in Earths North-south direction under the influence of Earths magnetic field. However, when the needle was kept below the wire and current was passed from A to B the north pole of the needle deflected towards the west and on reversing the direction of the current from B to A, it deflected towards the east. Similarly, when the needle was kept above the wire and current was passed from A to B the north pole of the needle deflected towards the east and on reversing the direction of the current from B to A, it deflected towards the west. This indicates that the direction of the magnetic field depends on the direction of current.