loop of wire travels from the left to the right through an inhomogeneous
magnetic field as shown in the animation. The green vertical line at x=0 is for
your reference. The induced emf in the loop is shown in Volts as is the
direction of the induced current.
the magnetic field perpendicular to the computer screen.
Reference: See Giancoli-PA: 21-3, Giancoli-SE: 27-3.
Bz(x<0)=constant, Bz(x>0)=constant, and Bz(x<0)<
Bz(x>0). From Lenzís law, we know that the magnetic field must
be increasing out of the page across the green line. Note that some students
will assume that the magnetic field on the left of the green line is zero
(because the voltage shown is zero) and the magnetic field on the right is
positive (out of the page).
However, this is not necessarily the case. The only thing we do know is
that the magnetic field to the right of the line must be constant and greater
than the constant magnetic field to the left of the line.
Script Author: Mario Belloni