If the instantaneous magnetic flux and induced emf produced in a coil are and
PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences
Problem
If the instantaneous magnetic flux and induced emf produced in a coil are ϕ and e, respectively, then according to Faraday's law of electromagnetic induction:
(1) e must be zero if ϕ=0
(2) e=0 if ϕ=0
(3) e=0, but ϕ may or may not be zero
(4) e=0, then ϕ must be zero