Draw and label the diagram of an AC generator.

Important Questions on Magnetism and Electromagnetism

EASY

9th Tamil Nadu Board

IMPORTANT

Science Standard 9>Chapter 5 - Magnetism and Electromagnetism>textbook exercises>Q i

Transformer works on

EASY

9th Tamil Nadu Board

IMPORTANT

Science Standard 9>Chapter 5 - Magnetism and Electromagnetism>textbook exercises>Q i

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

EASY

9th Tamil Nadu Board

IMPORTANT

Science Standard 9>Chapter 5 - Magnetism and Electromagnetism>textbook exercises>Q i

The unit of magnetic flux density is

MEDIUM

9th Tamil Nadu Board

IMPORTANT

Science Standard 9>Chapter 5 - Magnetism and Electromagnetism>textbook exercises>Q v

State the advantages of AC over DC.

HARD

9th Tamil Nadu Board

IMPORTANT

Science Standard 9>Chapter 5 - Magnetism and Electromagnetism>textbook exercises>Q v

Differentiate step up and step down transformer.

MEDIUM

9th Tamil Nadu Board

IMPORTANT

Science Standard 9>Chapter 5 - Magnetism and Electromagnetism>textbook exercises>Q v

A portable radio has a built-in transformer so that it can work from the mains instead of batteries. Is this a step up or step down transformer? Give reason.

HARD

9th Tamil Nadu Board

IMPORTANT

Science Standard 9>Chapter 5 - Magnetism and Electromagnetism>textbook exercises>Q vi

Explain the principle, construction and working of a DC motor.

HARD

9th Tamil Nadu Board

IMPORTANT

Science Standard 9>Chapter 5 - Magnetism and Electromagnetism>textbook exercises>Q vi

Explain two types of transformer.