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A circular loop is placed in a uniform magnetic field. If the loop is rotated ab

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Question: A circular loop is placed in a uniform magnetic field. If the loop is rotated about its diameter, what happens to the induced EMF?

Options:

  1. It increases
  2. It decreases
  3. It remains constant
  4. It becomes zero

Correct Answer: It becomes zero

Solution: 

When the loop is rotated about its diameter, the angle between the magnetic field and the normal to the loop changes, but the magnetic flux remains constant. Therefore, the induced EMF becomes zero as there is no change in magnetic flux.

A circular loop is placed in a uniform magnetic field. If the loop is rotated ab

Practice Questions

Q1
A circular loop is placed in a uniform magnetic field. If the loop is rotated about its diameter, what happens to the induced EMF?
  1. It increases
  2. It decreases
  3. It remains constant
  4. It becomes zero

Questions & Step-by-Step Solutions

A circular loop is placed in a uniform magnetic field. If the loop is rotated about its diameter, what happens to the induced EMF?
  • Step 1: Understand that a circular loop is placed in a magnetic field.
  • Step 2: Know that the loop can rotate about its diameter.
  • Step 3: Recognize that when the loop rotates, the angle between the magnetic field and the loop changes.
  • Step 4: Remember that magnetic flux is the product of the magnetic field strength and the area of the loop perpendicular to the field.
  • Step 5: Realize that even though the angle changes, the area of the loop and the strength of the magnetic field remain constant.
  • Step 6: Conclude that since the magnetic flux does not change, there is no induced EMF.
  • Electromagnetic Induction – The principle that a changing magnetic flux through a loop induces an electromotive force (EMF) in the loop.
  • Magnetic Flux – The product of the magnetic field strength and the area of the loop perpendicular to the field, which determines the induced EMF.
  • Rotation and Magnetic Field Interaction – Understanding how the orientation of a loop in a magnetic field affects the magnetic flux and induced EMF.
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