4. A copper hoop is held in a horizontal plane in a uniform magnetic field whose

Question

4. A copper hoop is held in a horizontal plane in a uniform magnetic field whose field lines run along the north-south direction, as shown in the figure (viewed from above). Describe one thing we could do to induce a N current in the hoop. A circular wire loop has a current flowing clockwise (as viewed from above). A second, identical circular loop is a) brought in above the first loop, b) held in place for a few seconds, and c) then moved away again. 5. What is the direction of current flow (if any) in the second loop during each phase of its motion? Brought in above the first loop: a. b. Held in place for a few seconds: c. Moved away again: 6. Explain your answer for one part from #5.

Explanation / Answer

(4)One thing that we can do to induce the current in the hoop is change the magnetic field strength B.

We can either increase or even decrease B. This changes the flux linked with the hoop and emf and thereby current is induced.

[Another method is to change the orientation of the hoop]

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