First slide
Magnetic flux and induced emf
Question

The four wire loops shown in figure have vertical edge lengths of either L,2L, or 3L. They will move with the same speed into a region of uniform magnetic field B directed out of the page. Rank them according to the maximum magnitude of the induced emf greatest to least.

Moderate
Solution

Induced emf depends upon vertical edge.

Vertical edge of (4) is longest and (1) has shortest.

Vertical edge of (2) and (3) is same.

 

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