Eddy Currents questions with solutions

Showing 1–5 of 5 questions

• Multi-correctmediumElectromagnetic InductionEddy Currents

  A thick metallic plate oscillates between the poles of a strong electromagnet. When the field is switched on, the oscillations die out rapidly. Which statements are correct?

  Select all that apply

  • Option A

    Eddy currents are induced in the plate.

  • Option B

    Magnetic forces associated with eddy currents oppose the motion.

  • Option C

    Mechanical energy is converted mainly into heat.

  • Option D

    Cutting narrow slots in the plate can reduce damping.

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• Multi-correctmediumElectromagnetic InductionEddy Currents

  Which statements about eddy currents are correct?

  Select all that apply

  • Option A

    They are used in electromagnetic braking.

  • Option B

    They are used in induction heating.

  • Option C

    They can cause unwanted transformer-core loss.

  • Option D

    Their direction is governed by Lenz's law.

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• Multi-correctmediumElectromagnetic InductionEddy Currents

  Why is a transformer core laminated into thin insulated sheets?

  Select all that apply

  • Option A

    To increase resistance of eddy-current paths.

  • Option B

    To reduce eddy-current power loss.

  • Option C

    To eliminate magnetic flux in the core.

  • Option D

    To reduce unwanted heating.

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• MCQmediumElectromagnetic InductionEddy Currents

  Two identical metal plates fall through the same localized magnetic-field region. One is solid and the other has many narrow longitudinal slots. Which plate experiences stronger magnetic braking?

  Options

  • Option A

    The solid plate.

  • Option B

    The slotted plate.

  • Option C

    Both equally.

  • Option D

    Neither plate.

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• A/RmediumElectromagnetic InductionEddy Currents

  Consider a strong magnet falling through a vertical conducting copper tube.

  Assertion

  A strong magnet can fall much more slowly through a copper tube than through a non-conducting tube.

  Reason

  The motion induces eddy currents whose magnetic effect opposes the flux change that produces them.

  Options

  • Option A

    Both A and R are true and R is the correct explanation of A.

  • Option B

    Both A and R are true but R is not the correct explanation of A.

  • Option C

    A is true but R is false.

  • Option D

    A is false but R is true.

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