The poles of a horseshoe magnet measure 
, as shown in the figure below.
The uniform magnetic flux density between the poles of the magnet is 
. Outside the region of the poles, the magnetic flux density is zero. A stiff copper wire is connected to a sensitive ammeter of resistance 
. A student moves the wire at a constant speed of 
between the poles in a direction parallel to the faces of the poles.
Calculate the magnetic flux between the poles of the magnet.
Use your answer in (a) to determine, for the wire moving between the poles of the magnet, the e.m.f. induced in the wire.
Show that the reading on the ammeter is approximately 
.
.
.
