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प्रश्न
How can the disadvantages of eddy currents be minimized?
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उत्तर १
Eddy currents heat up the core and dissipate electrical energy in the form of heat. Eddy currents are minimised by using laminations of metal to make a metal core. The laminations are separated by an insulating materials like lacquer. The plane of the lamination must be arranged parallel to the magnetic field, so that they current acroos the eddy current paths. This arrangements reduces the strength of the eddy currents.
उत्तर २
Minimize eddy currents:-
(i) In order to reduce the eddy current loss, the resistance of the core should be increased. Because of it, we laminate the core that will have relatively high resistance.
(ii) The plane of these sheets is placed perpendicular to the direction of the current so that they would cancel each other currents.
संबंधित प्रश्न
Two spherical bobs, one metallic and the other of glass, of the same size are allowed to fall freely from the same height above the ground. Which of the two would reach earlier and why?
How are eddy currents produced ?
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.
How are eddy currents generated in a conductor which is subjected to a magnetic field?
Give the uses of Foucault current.
The plane in which eddy currents are produced in a conductor is inclined to the plane of the magnetic field at an angle equal to ______.
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 ______.
Which one is not an application of eddy current?
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.
