Question
Download Solution PDFA bar magnet is allowed to fall vertically through a copper coil placed in a horizontal plane. The magnet falls with a net acceleration
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFCONCEPT:
- Lenz's law: It states that the current induced in an electrical circuit due to a change in the magnetic field is directed to oppose the change in flux and to exert a mechanical force that opposes the motion of the moving body.
- It is based on the conservation of energy principle.
EXPLANATION:
- When the magnet is allowed to fall then the magnetic flux in the coil changes.
- Due to this change in magnetic flux, an electric current is induced in the coil which will opposes the change in flux and a force is exerted on the bar magnet which opposes the motion of the magnet according to Lenz law.
- Due to this opposing force, the acceleration of the bar magnet reduces and it will be less than the acceleration due to gravity (g). So option 3 is correct.
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