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CBSE Class 12-science Answered

why is eddy current in circular motion?why does a transformer gets heated up??pls explain in detail....
Asked by Harini A | 13 Nov, 2014, 07:56: PM
answered-by-expert Expert Answer
Whenever there is a change in magnetic flux through a conductor, an emf is induced in it. This emf causes induced currents to flow in a closed loop around the conductor. These currents are known as eddy currents. Induced currents always form closed loops.
 
These loops may be circular if it is a cylindrical conductor, square if it is a square or rectangular conductor, etc. It is not necessarily circular.
However, the conventional representation is of a circle.
 
When a current flows through the coil of a transformer, there is heat loss according to Joule's law of heating H = I2Rt. Also, the change in flux in the coil induces eddy currents which results in heat losses. These are the reasons why a transformer gets heated up.
Answered by Romal Bhansali | 17 Nov, 2014, 11:02: AM
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