A small coil of wire is situated in a non-uniform magnetic field, as shown in the figure below.
The coil consists of 40 turns of wire and moves with a constant speed in a straight line. The coil has displacement 
from a fixed point P. The variation with of the magnetic flux 
in the coil is shown in the graph below.
The coil is moved at constant speed between point P and the point where 
.
Calculate the change in magnetic flux linkage of the coil.
The e.m.f. induced in the coil is 
. Determine the speed of the coil.
.
.
