How can I solve these? 1) How many turns of wire would be required to make a 160-mH inductor out of a 32.0-cm-long air-filled solenoid with a diameter of 6.3 cm ? N = turns

2) When a car drives through the Earth's magnetic field, an emf is induced in its vertical 55-cm-long radio antenna. What is the maximum emf induced in the antenna? The car's speed is 30.0 m/s on a horizontal road, the Earth's field is (5.0×10^−5 T), and the dip angle of 38 degrees. ε =