Lenz’s law is expressed by the following formula (here e = induced e.m.f., `phi` = magnetic flux in one turn and N = number of turns)

Options

A. `e=-N (dphi)/(dt)`
B. `e=N (dphi)/(dt)`
C. `e=-phi (dN)/(dt)`
D. `e=- d/(dt) (phi/N)`

Answer

A