A loop of a wire has the shape shown in the drawing. The top part of the wire is bent into a semicircle of radius r = 0.24 m.
The normal to the plane of the loop is parallel to a constant magnetic field ( = 0°) of magnitude 0.75 T. What is the change in the magnetic flux that passes through the loop when, starting with the position shown in the drawing, the semicircle is rotated through half a revolution?
Wb in weber
here is a pic: http://img213.imageshack.us/img213/4917/75104403bx0.png
not sure where the time comes from, how to figure that out from the diagram.
also, are A0 = x0*L
that is the area swept out in time t.
need help finding the variables for this one.