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  • 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 ver

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 :

Option: 1

development of air current when the plate is placed.


Option: 2

induction of electrical charge on the plate


Option: 3

shielding of magnetic lines of force as aluminium is a paramagnetic material.


Option: 4

electromagnetic induction in the aluminium plate giving rise to electromagnetic damping.


Answers (1)

best_answer

 

practical transformer -

\eta % = \frac{P_{out}}{P_{out}+P_{loses}}\times 100

-

 

 The aluminium plate will induce current on its surface and hence it will loose energy because of heating. Loss of energy will have cause damping in the coil and hence it finally stops.

Posted by

himanshu.meshram

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