NAEST 2020: Eddy Current and Magnetic Brake Electromagnetism
Question:
NAEST 2020: Eddy Current and Magnetic Brake | Electromagnetism
The video shows a metallic disk rotating about a horizontal axis with the help of an electric circuit. As one pole of a magnet is brought closer to it, it slows down. Choose the correct option(s).
- Currents are set up in the disk when the pole is brought near it
- If the magnet is sufficiently strong, the disk can stop.
- Magnetic forces of Bqv type act on the free electrons of the disk which are in front of the pole brought.
- Consider the free electrons of the disk close to the pole brought but not in front of it. Magnetic forces of $Bqv$ type act on these electrons.
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