Name: An Elementary Study of Domestic Electric Circuits
Uploaded: 2019-07-19
Duration: 5 min 52 s
Description: The electricity we consume is produced through electromagnetic induction at power plants. In this video, we will see the journey of electricity from the powe...

Question

You are given a strong bar magnet and a compass. Describe a method by which the magnetic field lines due to the bar magnet can be drawn.

Accepted Answer

Activity:

Take a drawing sheet and fix it on a smooth table with adhesive tape.

Place a bar magnet in the middle of the drawing sheet and add its boundary with sharp pencil. Place a magnetic compass at various points near the magnet, and note the direction in which its needle comes to rest at these points. Figure below shows these directions at points such as A, B, C, D, E and F. The direction of the needle at a point gives the direction of the magnetic field at that point. Place the compass close to the north pole of the magnet. Once the needle comes to rest, look from above, and with a pencil, mark the position of the north pole of the needle on the sheet. When we join points A, B, C, D, E and F, we obtain a closed curve called magnetic lines of force.

If we draw a tangent at any point on these lines, the magnetic field at that point will be along the tangent. Figure shows some magnetic field lines due to a bar magnet.

You are given a strong bar magnet and a compass. Describe a method by which the magnetic field lines due to the bar magnet can be drawn.

Important Questions on Magnetic Effect of Electric Current

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