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This activity helps us to draw the field lines of a bar magnet by ourselves.
Let us perform the following activity.
Steps:
- To do this activity, take a small compass and a bar magnet.
- Using an adhesive material, locate the magnet on a sheet of white paper fixed on a drawing board.
- Mark the boundaries of the magnet.
- Locate the compass near the north pole of the bar magnet.
How does it act?
The south pole of the needle moves towards the of the bar magnet. The north pole of the compass is pointed away from the of the bar magnet.
- Observe and mark the position of two ends of the needle.
- Now relocate the needle to a new position such that its south pole obtains the position previously occupied by its north pole.
- In this way, progress step by step until you reach the magnet's south pole, as shown in the below figure.
Position of the needles from north to the south pole
- Connect the points recorded on the paper by a smooth and uniform curve. This curve represents a field line.
- Repeat the above steps and draw as many lines as you can. You will get a pattern. These lines represent the magnetic field around the magnet. These are known as magnetic field lines.
- Note the deflection in the compass needle as you move it along a field line. The deflection as the needle are moved towards the poles.
We know that the magnetic field is a quantity that has .
The direction of the magnetic field is known to be the direction in which the compass needle's moves inside it. Therefore, it is the practice that the field lines arise from the and join at the .
Inside the bar magnet, the direction of magnetic field lines is from its to its . Thus the magnetic field lines are looked at as the .
are found to cross each other.
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