Question

A compass needle is placed near a current-carrying wire. State your observation for the following cases and give reason for the same in each case-
A) Magnitude of electric current in the wire is increased.
B) The compass needle is displaced away from the wire.


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Answer 1

Answer:

a)If the magnitude of current is increased ,then the deflection of the compass will increase as the electric field created by the wire in turn creates a magnetic field which deflects the compass needle

Explanation:

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Answer 2

Answer:

(a) As the amount of magnetic field strength is directly proportional to the amount of current, so the deflection of compass needle increases.

(b) Since magnetic field strength at a point is inversely proportional to the distance from the wire. Hence deflection of compass decreases when it is displaced away from the conductor