Electricity and Magnetism — Prelims Questions

Which of the following statements about electromagnetic waves is INCORRECT?

Consider the following statements regarding the working principle of an electric generator and an electric motor: 1. An electric generator converts mechanical energy into electrical energy based on electromagnetic induction. 2. An electric motor converts electrical energy into mechanical energy based on the magnetic effect of electric current. 3. Both devices essentially use the same fundamental components but operate in reverse principles. Which of the statements given above are correct?

Which of the following phenomena is NOT directly explained by electromagnetic induction?

Consider the following statements about Earth's magnetic field: 1. It is believed to be generated by the convection of molten iron in the outer core. 2. It protects Earth from harmful solar winds and cosmic radiation. 3. The magnetic North Pole coincides exactly with the geographic North Pole. Which of the statements given above are correct?

Which of the following is a direct application of the principle of electromagnetic waves?