Advertisements
Advertisements
प्रश्न
Describe briefly three main useful application of eddy currents ?
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
State any two causes of energy loss in actual transformers.
A metallic bob A oscillates through the space between the poles of an electromagnet (See the figure). The oscillations are more quickly damped when the circuit is on, as compared to the case when the circuit is off. Explain.
State applications of eddy currents.
In which of the following devices, the eddy current is not used ______
How is Eddy current produced? How do they flow in a conductor?
What are eddy currents?
A constant retarding force of50 N is applied to a body of mass 20 kg moving initially with a speed of 15 ms-1. How long does the body take to stop?
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
