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NEET2019PhysicsElectromagnetic InductionActual

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

Options

  1. Ainduction furnace
  2. Bmagnetic braking in train
  3. Celectromagnet
  4. Delectric heater

Correct answer

D. electric heater

Step-by-step solution

In an Induction furnace, a coil carrying AC surrounds the chamber of metal. Eddy currents are induced in the metal. The circulation of these currents generates high temperature which is used to melt metals. After melting, these melted metals are mixed to make alloys of the same composition. Mechanical brakes are based on friction. But, magnetic brakes have Eddy current. Brakes have a disc which rotates perpendicular to the magnetic field. As the disc rotates, Eddy currents are induced. Then power is dissipated thro

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