- #1
jdstokes
- 523
- 1
Two loops, A and B, are aligned parallel to each other. There is a current in loop A, which induces a current in loop B. How does the current in loop A change with time?
By Lenz's Law, the current in loop B creates a magnetic field which opposes the change in magnetic flux which created it, in other words, it opposes the increase of A's magnetic field. This much makes sense. But apparently this also implies that the change in A's field must reduce the magnetic field of B. So A's field increases with time.
I cannot understand why the change in A's field must reduce B's field. What law is being employed here, and why does it follow from the fact that B opposes the change in A?
Thanks.
James
By Lenz's Law, the current in loop B creates a magnetic field which opposes the change in magnetic flux which created it, in other words, it opposes the increase of A's magnetic field. This much makes sense. But apparently this also implies that the change in A's field must reduce the magnetic field of B. So A's field increases with time.
I cannot understand why the change in A's field must reduce B's field. What law is being employed here, and why does it follow from the fact that B opposes the change in A?
Thanks.
James