In which of the following devices, the eddy current effect is not used \( \mathrm{P} \) (1) Elec...

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In which of the following devices, the eddy current effect is not used
\( \mathrm{P} \)
(1) Electric heater
W
(2) Induction furnace
(3) Magnetic braking in train
(4) Electromagnet
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