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Which of the following statements is /are correct

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Eddy currents are undesirable since they heat up the core and dissipate electrical energy in the form of heat

Eddy currents are minimized by using lamenations of metal separated by lacquer and by making rectangular slots on metal

Eddy currents are used for magnetic braking in trains, electromagnetic damping induction furnace ; electric power meter

all are true

answer is D.

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Detailed Solution

Eddy currents are produced due change is magnetic flux in a plate in small loops which can be reduced by cutting grooves and laminating , due to eddy currents conductor get heated up and it is used in magnetic breaking and electromagnetic damping.

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