Magnetism and Electromagnetism | Unit 5 | Class 9 | Physics | Science | Samacheer Kalvi

by michaelg October 15, 2021

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00:00 Introduction
00:12 Choose the correct answer
01:34 Fill in the blanks
02:12 Match the following
02:49 True or false

Questions answered in this video –

1. Which of the following converts electrical energy into mechanical energy?

2. Transformer works on

3. The part of the AC generator that passes the current from the armature coil to the external circuit is

4. The unit of magnetic flux density is

5. The SI Unit of magnetic field induction is _______.

6. Devices which is used to convert high alternating current to low alternating current is________

7. An electric motor converts ________

8. A device for producing electric current is _________

9. Magnetic material

10. Non-magnetic material

11. Current and magnetism

12. Electromagnetic induction

13. Electric generator

14. A generator converts mechanical energy into electrical energy

15. Magnetic field lines always repel each other and do not intersect

16. Flemings Left hand rule is also known as Dynamo rule.

17. The speed of rotation of an electric motor can be increased by decreasing the area of the coil.

18. A transformer can step up direct current

19. In a step down transformer the number of turns in primary coil is greater than that of the number of turns in the secondary coil.