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Electromagnets quiz

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The electromagnet shown will not be made stronger if:

(a) More turns are added(b) An extra cell is added(c) The iron core is removed(d) The wire has less

resistance, so it carries more current.

1

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The lines shown here on this diagram:

(a) Carry the electric current (b) Are there only when the

current is off. (c) Show the flow of charges (d) Show the pattern of the

magnetic field.

2

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This diagram explains how an electromagnet is used to make:

(a) Sound (b) Light (c) Electric currents (d) Magnetic fields

3

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The frequency of the vibrations shown depend on:

(a) Strength of the permanent magnet.

(b) Strength of the current (c) Number of times the

current changes direction every second

(d) The poles of the permanent magnet

4

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The diagram above shows a: (a) Relay (b) Electric bell (c) Loudspeaker (d) Reed switch

5

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The electromagnet shown in this diagram is being used to:

(a) Move plastic rubbish (b) Move steel rubbish (c) Move household

rubbish (d) Move garden rubbish

6

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The loudness of the bell depends on:

(a) The size of the gong(b) The strength of the

current(c) The number of turns on

the electromagnet(d) All of the above

7

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Which statement is true? (a) This train is powered by electromagnets. (b) This train uses electromagnets as wheels. (c) This train is supported by electromagnets. (d) This train has very high friction on the rails.

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The frequency of this bell will be higher if:

(a)The strength of the current is increased

(b) The number of turns are increased

(c) The length of the metal strip is reduced

(d) The metal in the strip is less springy

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The gadget shown in this picture:

(1) is impossible to make (2) uses trick

photography: (a) (1) true (2) true (b) (1) true (2) false (c) (1) false (2) true (d) (1) false (2) false

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8J – Magnets and Electromagnets

Old Joe has become hard of hearing and cannot hear his electric doorbell when it rings. Electric doorbells contain an electromagnet. Help old Joe by finding out what could be done to make the door bell ring more loudly. Write a plan for an experiment to test out your idea.