The side length (in metres) of a square conducting loop varies with time according to

PHYSICS · Subjective · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

The side length

l

(in metres) of a square conducting loop varies with time according to

l = 0.10 + 0.02t

, where

t

is in seconds. The loop is placed in a uniform magnetic field given by

B = 0.40t

tesla, directed normal to its plane. Determine the magnitude of the induced emf in the loop at

t = 3.0\,\text{s}