Define magnetic flux.
A square coil of wire of side length 
consists of 8 insulated turns. The coil is stationary in a uniform magnetic field. The plane of the coil is perpendicular to the magnetic field, as shown in the figure below.
The flux density 
of the magnetic field varies with time 
as shown in the graph below.
Determine the magnetic flux linkage inside the coil at time 
. Give a unit with your answer.
State how the graph above shows that the electromotive force (e.m.f.) 
induced across the terminals between 
and is constant.
Calculate the magnitude of .
, perpendicular to the magnetic field.
.
.
