The four wire loops shown 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 `vec(B)` directed out of the page. Rank them according to the maximum magnitude of the induced emf greatest to least.

Options

A. (a) `1 and 2 tie, then 3 and 4 tie`
B. (b) `3 and 4 tie, then 1 and 2 tie`
C. ( C) `4, 2, 3, 1`
D. (d) `4 then 2 and 3 tie`, and then `1`

Answer

D

Explanation

(d) Induced emf depends upon vertical edge.