Question

a compass needle is placed near a current carrying straight conductor state your Observation for the following cases and give reason for the following when magnitude of electric current is increased and the compass needle is displaced away from the conductor

Answer 1

The compass needle is deflected due to a force is acting on it when we apply current

As flemings left hand thumb rule state

Answer 2

Answer:

The deflection is maximum when the conductor through A is perpendicular to the plane of the paper and the field due to it is maximum in the plane of the paper.

Explanation:

According to the Right hand thumb rule, the direction of the magnetic field is perpendicular to the direct of the current and if a magnetic compass is brought closer to the current carrying conductor, the deflection is maximum. But when the needle is placed near the point A on the plane as that of the paper as given in the figure, there is no deflection.