Question

Why does a magnetic compass shows different deflection of its needle when put below and above the wire of a circuit????

Answer 1

• If we Place a straight current carrying wire (the direction of the flow current is from south to north) such that the wire is placed below a compass needle such that the wire is parallel to the compass needle, the north pole of the compass needle deflects towards the east.
• If we Place a straight current carrying wire (the direction of the flow current is from north to south) such that the wire is placed below a compass needle such that the wire is parallel to the compass needle, the north pole of the compass needle deflects towards the west.

Compass needle gets deflected in presence of current carrying circuit because current through ckt cause for a magnetic field around the ckt...and the compass made like that to reflect in presence of magnetism. It gets deflected on earth towards north also because of a huge magnetism of earth. A compass points towards the North Pole, which is magnetic.