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Why is the iron core of a transformer made laminated instead of being in one solid piece?
Eddy currents do not cause:
Eddy current when produced it causes damping heat loss energy loss but it don't produce any type of sparking because the electrons are only at the surface of the conductor and the electrons do not jump off to enter the air and heat it.
Foucault Currents are also called
Eddy currents have negative effects. Because they produce:
The no-load current drawn by transformer is usually what percent of the full-load current ?
Which of the following will not increase the size and effect of eddy current?
A circular coil of area 200 cm2 and 25 turns rotates about its vertical diameter with an angular speed of 20 ms-1 in a uniform horizontal magnetic field of magnitude 0.05 T. The maximum voltage induced in the coil is:
Here w is angular speed.
Which of the following is not an application of eddy currents?
Although eddy currents are undesirable, still they find applications in the following devices:
In electromagnetic induction, line integral of induced field E around a close path is __________, induced electric field is ___________.
In electromagnetic induction, line integral of induced field E around a close path is non zero, and induced electric field is non conservative.
Identify the law which is used to find out the direction of eddy currents.
In the dead beat galvanometer, the coil is wound on a frame made of:
Aluminium is used as a coil which is a good conductor.
Dead beat galvanometer:
Identify the type of commercial motor which works as a consequence of eddy currents.
Eddy currents can be induced in
Eddy currents are produced by varying magnetic field in solid plates, blocks and wires.
Eddy currents are loops of electrical current induced within conductors by a changing magnetic field in the conductor, due to Faraday's law of induction.
Name the current induced in solid metallic masses when the magnetic flux threading through them changes.
How can electromagnetic damping be increased?