Physics · Electromagnetic induction: Faraday's law, induced emf and current, Lenz's law, eddy currents, self and mutual inductance
A magnet is allowed to fall through a copper circular wire. Then during fall:
A magnet is allowed to fall through a copper circular wire. Then during fall:
- A. the electric current flows through the wire
- B. the acceleration of magnet is less than gravitational acceleration
- C. the acceleration of magnet is equal to gravitational acceleration
- D. the acceleration of magnet is greater than gravitational acceleration
Step-by-step solution
As the magnet falls through the copper loop, the changing magnetic flux induces an emf and a current. By Lenz's law, the induced current creates a magnetic field that opposes the motion, resulting in an upward magnetic force on the magnet. This reduces the net downward force, so the magnet's acceleration is less than the gravitational acceleration g.
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