A conducting hula-hoop lies on the ground in the Earth\'s magnetic field. Assume

Question

A conducting hula-hoop lies on the ground in the Earth's magnetic field. Assume the field is constant. The magnetic field makes an angle of 40 degree with the ground. Which of the following does not result in an emf around the loop? flipping the loop over stretching the hoop so the radius becomes larger sliding the loop along the ground folding the hoop, so that it becomes shaped The magnetic field at the right is increasing in strength. What is the direction of the induced current in the conducting loop (dark circle) shown on the diagram? clockwise counterclockwise There is no induced current.

Explanation / Answer

1)

ANSWER is : (c) sliding the loop along the ground.

Explanation : when the loop slides along the ground, the magnetic flux does not change as either the magnetic field, the angle or the area through which the magnetic field enters change .

For all other cases, one or more of the variables (magnetic field, angle , area) change so they will cause the flux to change and thus there would be a induced emf

2)

The applied magnetic field is directed out of the page and is increasing . Thus , the induced magnetic field must be directed into the page. For this the induced current must be clockwise (using Right Hand Thumb Rule).

So, answer is (a) Clockwise

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.