Explanation
A transformer works on the principle of mutual induction.
Eddy current reduces after lamination of the core because transformer works on induction. Induction works when current flows in one conductor and the magnetic field forms around that. Conductor sweeps the other conductor and induces the voltage . If we didn’t laminate core, the core would provide a place for the magnetic lines to produce current and that current in the core would heat the core really fast and waste energy so by laminating cores, we break up the current paths with in core and limited eddy current.
The DC generator must be mixed wound to withstand the load variation.
Eddy current has application in induction furnance. Joule’s heat causes the melting of a metal piece placed in a rapidly changing magnetic field.
Iron losses:- In actual iron cores, inspite of lamination, eddy currents are produced. The magnitude of eddy current may be small and a part of energy is lost as the heat produced in an iron core.
Copper losses:- In practice the coils of the transformer posses resistance. So, a part of energy is lost due to the heat produced in resistance of coil.
Flux Leakage:- The coupling between the coils is seldom perfect. So, whole of the magnetic flux produced by the primary coil is not linked up with secondary coil.
Option (1) is correct, As of transformer works only on AC not DC.
Transformer does not change the frequency of input AC.
A uniformly moving charge produces both electric and magnetic fields. So energy associated with it will be partially due to electric field.
The oil filled in transformer should have high dielectric strength.
DC motor converts electrical energy into mechanical energy. It employs Fleming’s left hand rule.
DC generator converts mechanical energy into electrical energy in the form of DC. It employs Fleming’s right hand rule.
The electric field induced by changing magnetic field depends upon the rate of change of magnetic flux. So it is non-conservative.
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