Question:
A magnet is dropped down an infinitely long vertical copper tube. Then
A magnet is dropped down an infinitely long vertical copper tube. Then
Updated On: May 30, 2022
- the magnet moves with continuously increasing velocity and ultimately acquires a constant terminal velocity
- the magnet moves with continuously decreasing velocity and ultimately comes to rest
- the magnet moves with continuously increasing velocity but constant acceleration
- the magnet moves continuously increasing velocity and acceleration.
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The Correct Option is A
Solution and Explanation
The induced e.m.f. starts opposing the motion.
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Concepts Used:
Electromagnetic Induction
Electromagnetic Induction is a current produced by the voltage production due to a changing magnetic field. This happens in one of the two conditions:-
- When we place the conductor in a changing magnetic field.
- When the conductor constantly moves in a stationary field.
Formula:
The electromagnetic induction is mathematically represented as:-
e=N × d∅.dt
Where
- e = induced voltage
- N = number of turns in the coil
- Φ = Magnetic flux (This is the amount of magnetic field present on the surface)
- t = time
Applications of Electromagnetic Induction
- Electromagnetic induction in AC generator
- Electrical Transformers
- Magnetic Flow Meter