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PhysicsNEET 2024Motional EMF and eddy currents

Electromagnetic Induction

A sheet is placed on a horizontal surface in front of a strong magnetic pole. A force is needed to:

A. hold the sheet there if it is magnetic.

B. hold the sheet there if it is non-magnetic.

C. move the sheet away from the pole with uniform velocity if it is conducting.

D. move the sheet away from the pole with uniform velocity if it is both non-conducting and non-polar.

Choose the correct statement(s) from the options given below:

  1. A.A and C only✓
  2. B.A, C and D only
  3. C.C only
  4. D.B and D only

Solution

A magnetic sheet is attracted and needs a force to hold it (A). Moving a conductor away from a pole induces eddy currents that oppose the motion, so a force is needed to keep it moving uniformly (C). A non-magnetic sheet feels no force (B false); a non-conducting, non-polar sheet has no induced currents (D false).

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