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Electromagnetism questions

Electromagnetism questions | form four Physics

Find Electromagnetism examination questions, form four Physics in acaproso.com

# Question
1

Explain the meaning of
(i) Magnetic induction.
(ii) Magnetic screening.


Short answers
2

Draw a circuit diagram of an electric bell and explain how it works.


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3

State what you understand by the following expressions:
(i) Magnetic field. (ii) Magnetic lines of force.


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4

Sketch the lines of force between two (2) bars of magnet placed on a horizontal table with
(i) their N-poles facing each other.
(ii) the N-pole of one facing the S-pole of the other.


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5

Explain why:
(i) the strength of a magnet cannot be increased beyond a certain limit.
(ii) an increase in temperature weakens or destroys the magnetism of a magnet.


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6

Why is high voltage used for commercial transmission of electrical energy?


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7

What is electromagnetic induction?


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8

Fig 2 below shows two coils X and Y. X is connected to a battery and Y is connected to a centre galvanometer G.

Electromagnetic induction- electromagnetism physics form four 4

(i) State and explain the deflection of the galvanometer needle when the switch K is closed for a few seconds and then opened.
(ii) Why must the galvanometer be a centre zero type?
(iii) What would be done in X to increase the current induced in circuit Y?


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9

State four characteristics of a highly sensitive galvanometer.


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10

What are eddy currents?


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