Chapter Name: Electromagnetism
Activity Name: Magnetic field lines in Electromagnetism
This experiment demonstrates the concept of magnetic field lines using a bar magnet and a compass. By placing the bar magnet on a sheet of paper with a compass and tracing the compass needle’s orientation at different points around the magnet, the magnetic field lines are visualized.
- White sheet of paper
- Bar magnet
Step by Step Procedure:
- Place the white sheet of paper on a horizontal table.
- Put two dots on either side of the compass needle on the paper.
- Draw a straight line connecting the two dots, representing the North and South of the Earth.
- Place the bar magnet on the drawn line in a way that its north pole points towards geographic north.
- Position the compass at the north pole of the bar magnet and put a dot to mark its position.
- Remove the compass and place it at the dot’s location; observe the change in the compass needle’s direction.
- Repeat step 6, placing a dot at the north pole of the compass needle each time you move it to a new location.
- Continue this process till you reach the south pole of the bar magnet.
- Connect the dots from the north pole (‘N’) of the bar magnet to the south pole (‘S’) of the bar magnet, forming a curved line.
- Select another point near the north pole of the bar magnet and repeat the process to obtain different curved lines, as shown in figure 2.
The experiment will reveal a series of curved lines that represent the magnetic field lines around the bar magnet.
- Handle the bar magnet and compass with care to avoid any damages.
- Ensure the compass is not placed too close to other magnetic or metallic objects during the experiment, as it may affect the accuracy of the observations.
Lesson Learnt from Experiment:
This experiment helps in understanding the concept of magnetic field lines and how they form around a bar magnet. The curved lines observed represent the magnetic field’s direction and strength, flowing from the north pole to the south pole of the magnet.