Question

How will you decide wether the magnetic field at a point is due to some current?​

Answer 1

Answer:

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Explanation:

Place a compass needle at the given point. If it stays in the north-south direction, then the magnetic field is due to earth. If the needle points along any direction other than north-south direction, then the field is due to some current carrying conductor.

Answer 2

Answer:

This can be easily observed by Oersted's experiment.

Explanation:

First placed a compas near the electric circuit.

you will notice that north pole of compas suddenly moves in a particular direction.

It decides that magnetic field is present at that place.

If north and south pole of compas don't suddenly move at a point , then you decide that there is not magnetic field.

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