a long solenoid has 50 turns per centimeter of wire carrying a current of 8a. the solenoid has a radius of 50 cm. find the flux passing through a circular coil of radius 6cm lying inside the solenoid with the plane of the coil (a) perpendicular to the magnetic field of the solenoid or (b) at an angle of 60 degrees to the magnetic field of the solenoid.