HARD
10th ICSE
IMPORTANT
Earn 100

Draw a labelled diagram of a simple a.c. generator.

Important Questions on Electro-Magnetism

EASY
10th ICSE
IMPORTANT
Selina Icse Concise Physics For Class 10>Chapter 10 - Electro-Magnetism>EXERCISE-10(C)>Q 21

In an a.c. generator the speed at which the coil rotates is doubled. How would this affect

(a) the frequency of output voltage

(b) the maximum output voltage.

EASY
10th ICSE
IMPORTANT
Selina Icse Concise Physics For Class 10>Chapter 10 - Electro-Magnetism>EXERCISE-10(C)>Q 22
Suggest two ways in an a.c. generator to produce a higher e.m.f.
EASY
10th ICSE
IMPORTANT
Selina Icse Concise Physics For Class 10>Chapter 10 - Electro-Magnetism>EXERCISE-10(C)>Q 26
For what purpose are the transformers used? Can they be used with a direct current source?
EASY
10th ICSE
IMPORTANT
Selina Icse Concise Physics For Class 10>Chapter 10 - Electro-Magnetism>EXERCISE-10(C)>Q 27
State two factors on which the magnitude of an induced e.m.f. in the secondary coil of a transformer depends.
EASY
10th ICSE
IMPORTANT
Selina Icse Concise Physics For Class 10>Chapter 10 - Electro-Magnetism>EXERCISE-10(C)>Q 27
How are the e.m.f in the primary and secondary coils of a transformer related with the number of turns in these coils?
MEDIUM
10th ICSE
IMPORTANT
Selina Icse Concise Physics For Class 10>Chapter 10 - Electro-Magnetism>EXERCISE-10(C)>Q 28
Draw a labelled diagram to show the various components of a step-up transformer.
MEDIUM
10th ICSE
IMPORTANT
Selina Icse Concise Physics For Class 10>Chapter 10 - Electro-Magnetism>EXERCISE-10(C)>Q 29
Name the device used to transform 12 V a.c to 200 V a.c. Name the principal on which it works.
HARD
10th ICSE
IMPORTANT
Selina Icse Concise Physics For Class 10>Chapter 10 - Electro-Magnetism>EXERCISE-10(C)>Q 30
Draw a labelled diagram of a step-up transformer and explain how it works. State two characteristics of the primary coil as compared to its secondary coil.