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

Briefly explain an activity to plot the magnetic field lines around a bar magnet. Sketch the field pattern for the same specifying field directions. A region 'A' has magnetic field lines relatively closer than another region 'B'. Which region has stronger magnetic field? Give reason to support your answer.

Accepted Answer

Aim: To draw magnetic field lines produced by a bar magnet.

Materials required: A wooden board, a white sheet, drawing pins, a bar magnet, a plotting compass and a pencil.

Procedure: To draw magnetic field lines, fix a white paper on a drawing board with the help of drawing pins and keep a bar magnet in the middle of the sheet. Now, place the magnetic compass near the north pole. The magnetic needle of the compass orients itself such that the tails are towards the north pole. Mark the point A on the white paper where the arrowhead of the compass is oriented. Now, pick up the compass and keep it again on the paper such that the tail orients towards point A and mark the point B along the direction of the arrowhead of the needle. Repeat the same operation to get points C, D, E, F, G and H. Repeat the same process for the other side to get points A', B', C', D', E', F', G' and H'.

Observations: On joining the points we get the magnetic lines of force. Similarly, we can draw other magnetic field lines. The overall picture of magnetic field lines is as shown in the Figure. 2.

Conclusion: The pattern of magnetic field lines is as shown in the Figure. 2.

Figure. 2. Magnetic field lines.

We can show the presence of a magnetic field in a given region 'A' and 'B' with the help of magnetic field lines. The magnetic lines at 'A' are more than the magnetic lines at 'B'. Therefore, region 'A' will have a stronger magnetic field as the field lines are relatively closer.

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