Malaysia SPM Form 5 Physics - Electromagnetism

1.1 Introduction to Magnetism
1.2Straight Wire and Coil
1.3 Solenoid
1.4 Uses of Electromagnet
2.1 Catapult Force
2.2 Application of Catapult Force
3.1 Electromagnetic Induction
3.2 DC and AC Generator
4.1 Transformer
4.2 Transformer - Calculation
5.1 Generation and Transmission of electricity

Application of Catapult Force

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1. Which of the following will affect the speed of rotation of a direct current motor?

I.  The number of turns of wire in the coil.
II.  The area of the coil
III.  Strength of the magnetic field.
IV.  The direction of the current.
V.  The magnitude of the current in the coil.
Choice 1 I, III and V only
Choice 2 I, II, III and V only
Choice 3 II, III and IV only
Choice 4 III, IV and V only

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2. The diagram shows the structure of a direct current motor. Which of the following is true regarding the part X, Y and Z of the motor?

I. X: to conduct electric current from Z to Y.
II. Y: to change the direction of current in Z in every half revolution.
III. Z: to produce force to rotate the motor.
Choice 1 I, II and III
Choice 2 II and III only
Choice 3 I and II only
Choice 4 I and III only

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3. In a direct current motor, the current in the coil changes direction every half rotation. This is done by
Choice 1 the carbon brush
Choice 2 two slip-rings
Choice 3 a split ring commutator
Choice 4 the armature

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4. In a direct current motor, the current in the coil changes direction every half revolution. The reason of doing so is
Choice 1 To make the coil rotate faster.
Choice 2 To control the speed of the coil.
Choice 3 To make sure that the coil is always rotates in 1 direction.
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5. The diagram shows the structure of a direct current motor. What is the direction of the motion of part Z when the switch is on?
Choice 1 Clockwise
Choice 2 Anticlockwise
Choice 3 Vibrating in between the two magnet.
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electromagnetism notes