1.

Why does the picture appear distorted when a bar magnet is brought close to the screen of a television? Explain. (OR) Explain magnetic force on moving charge and current carrying wire. (OR) What happens when you bring a bar magnet near a picture of TV screen ? What inference do you conclude from this activity?

Answer»

This is due to the fact that magnetic field exerts a force on the moving charge. 

TV screen Activity : 

  • Take a bar magnet and bring it near the TV screen. 
  • Then the picture on the screen is distorted. 
  • Here the distortion is due to the motion of the electrons reaching the screen are affected by the magnetic field. 
  • Now move the bar magnet away from the screen. 
  • Then the picture on the screen stabilizes. 
  • This must be due to the fact that the magnetic field exerts a force on the moving charges. This force is called magnetic force. 
  • The magnitude of the force is F = Bqv where B is magnetic induction, ‘q’ is the charge and v is the velocity of the charged particle


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