Advertisements
Advertisements
Question
How can the disadvantages of eddy currents be minimized?
Advertisements
Solution 1
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.
Solution 2
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.
RELATED QUESTIONS
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.
Why and where are eddy currents are undesirable? How are they minimized?
Identify the wrong statement.
What are eddy currents?
If the length of a simple pendulum increases by 5%, then its period shall increase by ______.
Eddy currents are also known as ______
Consider a metallic pipe with an inner radius of 1 cm. If a cylindrical bar magnet of radius 0.8 cm is dropped through the pipe, it takes more time to come down than it takes for a similar unmagnetised cylindrical iron bar dropped through the metallic pipe. Explain.
