Explain an activity to show the effect of current on a compass needle
Answers
Answer:
if you hold a compass near a wire through which current is flowing, the needle on the compass will be deflected. Since compasses work by pointing along magnetic field lines, this means that there must be a magnetic field near the wire through which the current is flowing.
According to Faraday's first law when the magnetic flux linking a circuit changes, an electromotive force is induced in the circuit proportional to the rate of change of the flux linkage so if you hold a magnetic compass near a wire through which current is flowing, the needle on the magnetic compass will be deflected. Since compasses work by pointing along magnetic field lines, this means that there must be a magnetic field near the wire through which the current is flowing.
The law is proved by the above experiment.