JEE Main 2012Offline
- Exam
- JEE Main
- Year
- 2012
- Mode
- Offline
- Subject
- Physics
- Chapter
- Electromagnetic Induction
JEE Main 2012 · Offline · Physics · Electromagnetic Induction
A coil is suspended in a uniform magnetic field, with the plane of...
A coil is suspended in a uniform magnetic field, with the plane of the coil parallel to the magnetic lines of force. When a current is passed through the coil it starts oscillating; it is very difficult to stop. But if an aluminium plate is placed near to the coil, it stops. This is due to :
Options
- Adevelopment of air current when the plate is placed.
- Binduction of electrical charge on the plate
- Cshielding of magnetic lines of force as aluminium is a paramagnetic material.
- Delectromagnetic induction in the aluminium plate giving rise to electromagnetic damping.
Correct answer
D. electromagnetic induction in the aluminium plate giving rise to electromagnetic damping.
Step-by-step solution
Oscillating coil produces time variable magnetic field. It cause eddy current in the aluminium plate which causes anti-torque on the coil, due to which is stops.