30. Induction and Inductance

A square conducting loop with sides equal to $36\mathrm{cm}$ lies such that the plane of the loop is perpendicular to a $50\mu \mathrm{T}$ magnetic field. What is the flux through the loop?

In a physics laboratory experiment, a coil with 200 turns enclosing an area of 12 cm^2 is rotated in 0.040 s from a position where its plane is perpendicular to the earth's magnetic field to a position where its plane is parallel to the field. The earth's magnetic field at the lab location is 6.0*10-5 T. (a) What is the total magnetic flux through the coil before it is rotated? After it is rotated?