Advertisements
Advertisements
प्रश्न
Describe briefly three main useful application of eddy currents ?
Advertisements
उत्तर
Application of Eddy currents:
(i) Induction furnace: When a piece of metal, which is to be converted into an alloy, is wound by the circular conducting coil, a high frequency alternating current is passed through the coil which in turns changes the magnetic flux associated with the metal. This produces strong eddy currents that generate a large amount of heat in the metal block and melts it easily.
(ii) Electric brakes: Electromagnets are placed in the trains just above the rails. Whenever these electromagnets are activated, eddy currents are produced in such a way that they oppose the motion and stop the train.
(iii) Induction motor: A rotating magnetic field produces strong eddy currents in the rotor of the motor, which starts rotating in the direction of the field.
APPEARS IN
संबंधित प्रश्न
Give one example of use of eddy currents.
How are eddy currents generated in a conductor which is subjected to a magnetic field?
Write two examples of their useful applications .
Why and where are eddy currents are undesirable? How are they minimized?
Identify the wrong statement.
Two simple pendula of length L and 4L are pulled aside to the right and are at rest so that they make an angle 30° with the vertical. They are then released simultaneously at time t = 0. The time after which they will be in phase is ______.
For high frequency, capacity offers
A metal plate is getting heated. It can be because ______.
- a direct current is passing through the plate.
- it is placed in a time varying magnetic field.
- it is placed in a space varying magnetic field, but does not vary with time.
- a current (either direct or alternating) is passing through the plate.
