In a physics lab, a coil with 230 turns enclosing an area of is rotated during the time interval from a position in which its plane is perpendicular to the earth's magnetic field to one in which its plane is parallel to the field. The magnitude of the earth's magnetic field at the lab location is
What is the magnitude of the magnetic flux (φinitial) through the coil before it is rotated? and after it is rotated?
