State whether the following statements are true or false.

1. An electric motor converts mechanical energy into electrical energy.
2. (b) An electric generator works on the principle of electromagnetic induction.
3. (c) The field at the centre of a long circular coil carrying current will be parallel straight lines.
4. (d) A wire with a green insulation is usually the live wire of an electric supply.

Answer:

1. False
   An electric motor converts electrical energy into mechanical energy.
2. True
   A generator is an electric device that generates electricity by rotating a coil in a magnetic field. It works on the principle of electromagnetic induction.
3. True
   The field at the centre of a long circular coil carrying current will be parallel straight lines. A long circular coil is a long solenoid. The magnetic field lines inside the solenoid are parallel.
4. False
   A wire with a green insulation is usually the live wire of an electric supply. Live wire has red insulation cover, whereas earth wire has green insulation cover in domestic circuits.