A circular loop is placed in a uniform magnetic field. If the loop is rotated about its diameter, what happens to the induced EMF?
Practice Questions
1 question
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?
It increases
It decreases
It remains constant
It becomes zero
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.
Questions & Step-by-step Solutions
1 item
Q
Q: A circular loop is placed in a uniform magnetic field. If the loop is rotated about its diameter, what happens to the induced EMF?
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.
Steps: 6
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.
