6. A 100 turn square coil of area 0.040 m rotates about a vertical axis at 1500 rev/min. The horizontal magnetic field has a magnitude of 2.00 x 10-5 T. Find the maximum emf induced in the coil. B 7. A solenoid is made from a wire wound around a tube 36.0 cm long having a diameter of 8.00 cm. (a) If there are 580 turns of wire, find the inductance of this solenoid. (b) If the current in the solenoid increases at the rate of 4.0 A/s what is the self-induced emf in the solenoid