(a) An electric motor converts mechanical energy into electrical energy - false
=> An electric motor converts electrical energy into mechanical energy.
(b) An electric generator works on the principle of electromagnetic induction - true
(c) The field at the centre of a long circular coil carrying current will be parallel straight lines - true
(d) A wire with a green insulation is usually the live wire of an electric supply - false
=> Live wire has red insulation cover, whereas earth wire has green insulation colour in the domestic circuits.