how do you experimentally demonstrate that a current carrying conductor has a magnetic field around it
Answers
Take a magnetic needle pivoted at its centre and free to move in horizontal plane.
Take a thick and insulated copper wire PQ and connect it to the battery circuit through a key K and a variable resistance Rh.
Hold the wire PQ parallel and just above the axle of the magnetic needle and press the key. It is observed that N-pole of the needle points towards the west so long the current continues to flow through the wire. It is also observed that if the current is increased or decreased, the deflection of the magnetic needle also increases or decreases.
If the direction of the current through PQ is reversed, i.e., if the current flows from Q to P, then N-pole of the needle is deflected towards east, this experiment shows that a magnetic field is set up around a current carrying conductor.
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Using a compass
Explanation:
A current carrying conductor generates a magnetic field around it. This can be detected using a magnetic compass. A compass when brought near the conducting wire would deflect because of the presence of the magnetic field generated by the conducting wire.
A compass has a magnetic needle which gets disturbed under the influence of magnetic force exerted by the field.
Learn more about magnetic field generated due to conducting wire:
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