TBR: Conducting Loops in Field

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TBR Physics Book II page 137 Example 8.10a


“What is true of a conducting loop that spins within a magnetic field about an axis perpendicular to the magnetic field”?


Answer: It experiences an induced alternating current.



I understand that an alternating current is produced when the loop goes through cycles of entering and then exiting the magnetic field.



My question is: How do you know that the loop is actually entering/exiting the field? The question just says it “spins within a magnetic field” – it never says that part of the time during the spin, the loop is “out” of the magnetic field.

 

[IslandStyle808]

TBR Physics Book II page 137 Example 8.10a


“What is true of a conducting loop that spins within a magnetic field about an axis perpendicular to the magnetic field”?


Answer: It experiences an induced alternating current.



I understand that an alternating current is produced when the loop goes through cycles of entering and then exiting the magnetic field.



My question is: How do you know that the loop is actually entering/exiting the field? The question just says it “spins within a magnetic field” – it never says that part of the time during the spin, the loop is “out” of the magnetic field.

yeah the book does not explain it, but here is a link to a video from khan academy that does.

https://www.khanacademy.org/science/physics/electricity-and-magnetism/v/magnetism-9--electric-motors

Keep watching 10 and 11, it goes into more detail.