A) energy losses due to eddy currents may be minimized
B) the weight of the transformer may be reduced
C) rusting of the core may be prevented
D) ratio of voltage in primary and secondary may be increased
Correct Answer: A
Solution :
When magnetic flux linked with a coil changes, induced emf is produced in if and the induced current flows through the wire forming the coil. In 1895, Foucault experimentally found that these induced currents are set up in the conductor in the form of closed loops. These currents look like eddies or whirl pools and likewise are known as eddy currents. They are also known as Foucaults current. These currents oppose the cause of their origin, therefore, due to eddy currents, a great amount of energy is wasted in form of heat energy. If core of transformer is laminated, then their effect can be minimised.
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