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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

Correct answer: electric heater

Solution

Eddy currents are not utilized in electric heaters, as they work on the principle of Joule heating, where electrical energy is converted directly into heat. The other options involve the use of eddy currents for their operation.

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