.A 747 with a wingspan of 60 m is flying across an area of the earth where the earth's magnetic field is 5 x 10 ^-4 T. If the aircraft is travelling at 200 m/s perpendicular to the field, how much potential difference is induced between the wingtips.

2. A student, observing that a pendulum will oscillate by itself for over an hour, conceives the following idea for an electrical generator. Put a magnet on the end of a pendulum and let it swing past a coil of wire. The changing field should produce a current. Does this then give an hour of power?

3. Will dropping a bar magnet down a long copper tube produce a current in the tube? Explain.

4 A certain transformer has 500 turns on the primary. If 10 volts are applied to the primary, how many turns must the secondary have to produce 60 volts? If the current in the secondary is 1 amp, what was the current in the primary?

5. An ignition coil to start a car can produce as much as 25 kV. How does it get this voltage from 12 volts?

Once you think you have the answer, ask yourself how it uses a battery to do this since a battery is a DC source.

 

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