Chapter Name: Electromagnetism
Activity Name: CRT TV sensation in Electromagnetism
In this experiment, we will investigate the interaction between a CRT (Cathode Ray Tube) TV screen and a bar magnet. We will observe any sensations on our skin while standing near the TV screen when it is switched on.
Then, we will bring a bar magnet close to the TV screen and observe any effects on the displayed picture. Finally, we will analyze how the motion of electrons reaching the screen is affected by the magnetic field of the bar magnet, leading to a distorted picture.
- CRT TV (Cathode Ray Tube TV)
- Bar magnet
Step by Step Procedure:
- Stand near the CRT TV screen and switch it on.
- Observe if you feel any sensation on your skin while near the TV screen.
- Take the bar magnet and bring it near the TV screen.
- Observe any changes in the displayed picture on the screen; you will notice distortion.
- Move the bar magnet away from the screen.
- Observe that the picture becomes clearer again.
- Repeat the process to confirm that the motion of electrons is affected by the magnetic field produced by the bar magnet.
- You may feel a slight sensation on your skin when standing near the switched-on CRT TV screen.
- When the bar magnet is brought near the TV screen, the displayed picture will be distorted.
- Moving the bar magnet away from the screen will result in a clearer picture again.
- Handle the CRT TV and bar magnet with care to avoid any damage or injury.
- Do not place the bar magnet too close to the TV screen to prevent any potential harm to the TV.
Lesson Learnt from Experiment:
Through this experiment, we learn that the motion of electrons reaching the CRT TV screen is affected by the magnetic field of the bar magnet. This effect causes a distortion in the displayed picture due to the magnetic force exerted on the moving charges (electrons).