Which of the following statements is /are correct

Moderate

A

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

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

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

all are true

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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