In which of the following devices, the eddy current effect is not used?

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In which of the following devices, the eddy current effect is not used?

(1) Induction furnace

(2) Magnetic braking in train

(3) Electromagnet

(4) Electric heater

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Ans : (4) Electric heater

Explanation :

The Eddy current effect is not used in the devices called electric heaters.

Because they use Joule's heating effect.