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Concepts Of Physics MCQ Edition [Volume 2]PhysicsElectromagnetic Induction

A metal sheet is positioned in front of a strong magnetic pole. An external force is required to (Ignore any effects of paramagnetism, diamagnetism, and gravity.)

Options

  1. Ahold the sheet in place if the metal is nonmagnetic
  2. Bhold the sheet in place if the metal is magnetic
  3. Cmove the sheet away from the pole at a constant velocity if the metal is magnetic
  4. Dmove the sheet away from the pole at a constant velocity if the metal is nonmagnetic

Correct answer

D. move the sheet away from the pole at a constant velocity if the metal is nonmagnetic

Step-by-step solution

If the metal is magnetic, it experiences a strong attractive force towards the magnetic pole due to ferromagnetism. To hold it in place, an external force must be applied to balance this attraction. If the magnetic metal is moved away from the pole, an external force is required to overcome both the static magnetic attraction and the opposing magnetic force caused by induced eddy currents. If the metal is nonmagnetic, holding it in place does not require any external force because the magnetic flux is constant, res

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