Physics · Current loop as a magnetic dipole and its magnetic dipole moment, bar magnet as an equivalent solenoid, magnetic field lines
A bar magnet is dropped along the axis of copper ring held horizontally. The acc
A bar magnet is dropped along the axis of copper ring held horizontally. The acceleration of fall is
- A. equal to g at the place.
- B. less than \( g \)
- C. more than \( g \)
- D. depends upon diameter of the ring and length of the magnet
Step-by-step solution
As the magnet falls, the changing magnetic flux through the ring induces a current (Faraday's law). By Lenz's law, this induced current produces a magnetic field that opposes the change, creating an upward force on the magnet. This reduces the net downward force, so the acceleration is less than g.
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