State whether the following statements are true or false.

 

 

(a) An electric motor converts mechanical energy into electrical energy.

Answer

False

Explanation : An electric motor converts electrical energy into mechanical energy.

(b) An electric generator works on the principle of electromagnetic induction.

Answer

True

Explanation :

Electromagnetic induction is the process of production of electricity (electric current) when magnetic field changes

The electrical generator works on the principle that when a straight conductor is moved in a magnetic field, then current is induced in the conductor. 

(c) The field at the centre of a long circular coil carrying current will be parallel straight lines.

True

Explanation -

A long circular coil is a solenoid.

The field lines inside a solenoid are parallel.
magnetic-field-in-a-solenoid.jpg



(d) A wire with a green insulation is usually the live wire of an electric supply.

Answer

False

Explanation - A wire with a green insulation is usually the earth wire of an electric supply

different-types-of-wire-in-domestic-electric-circuit---teachoo.jpg

 

  1. Class 10
  2. Chapter 13 Class 10 - Magnetic Effects of Electric Current

About the Author

CA Maninder Singh's photo - Founder at Teachoo
CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo