The figure shows four wire loops, with edge lengths of either L or 2L. All four loops will move through a region of uniform magnetic field $\overrightarrow{B}$ (directed out of the page) at
the same constant velocity. Rank the four loops according to the maximum magnitude of the e.m.f. induced as they move through the field, greatest first

• A

  $\left({\epsilon }_c={\epsilon }_d\right)<\left({\epsilon }_a={\epsilon }_b\right)$

• B

  $\left({\epsilon }_c={\epsilon }_d\right)>\left({\epsilon }_a={\epsilon }_b\right)$

• C

  ${\epsilon }_c>{\epsilon }_d>{\epsilon }_b>{\epsilon }_a$

• D

  ${\epsilon }_c<{\epsilon }_d<{\epsilon }_b<{\epsilon }_a$