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

Electromagnet - Solenoid

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1. Which of the following materials is most likely to be used for the coil of an electromagnet?
Choice 1 Copper
Choice 2 Steel
Choice 3 Iron
Choice 4 Silver

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2. Which of the following materials is most likely to be used for the core of an electromagnet?
Choice 1 Copper
Choice 2 Steel
Choice 3 Iron
Choice 4 Silver

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3. Why iron is suitable to become a core of an electromagnet?

I  because it is easily to be magnetized.
II  because it is easily to be demagnetized.
III because it is a good conductor.
IV because it is a ferromagnetic material.

Choice 1 I and III only
Choice 2 I, II and III only
Choice 3 I, II and IV only
Choice 4 III and IV only

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4. Which diagram in the figure  shows the magnetic field pattern associated with a solenoid carrying current in the direction indicated?
Choice 1 P
Choice 2 Q
Choice 3 R
Choice 4 S

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5. Which diagram shows the magnetic field pattern associated with a solenoid carrying a current in the direction indicated?
Choice 1 P and S only
Choice 2 Q and R only
Choice 3 P only
Choice 4 Q only

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6. The figure shows a picture of solenoid. State the magnetic pole at X when the switch is closed.
Choice 1 North
Choice 2 South
Choice 3 Can be North or South, depends on the material of the core.
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7. The figure shows two solenoids are placed near each other. What will happen if the switches are switched on?
Choice 1 The two solenoids will repel each other.
Choice 2 The two solenoids will attract each other.
Choice 3 The two solenoids will charge each other.
Choice 4 The two solenoids will rotate.

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8. Which of the following methods can be used to increase the magnetic field strength of a solenoid?

I. Increases the current.
II. Increases the number of turns of wire of the solenoid.
III. Places a soft iron core in the solenoid.
IV. Use iron instead of copper as the wire of the solenoid.

Choice 1 I and II only
Choice 2 I and III
Choice 3 I, III and IV only
Choice 4 I, II and III only

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9. The figure shows a metal core placed in a solenoid. The metal becomes a permanent magnet after the switch is on for 30 minutes. Which metal is the core possible made of?
Choice 1 Soft iron
Choice 2 Steel
Choice 3 Zinc
Choice 4 Copper

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10. Which of the following statements is true regarding an electromagnet?

I. Electromagnets generate electric field around the conductor.
II. Electromagnet is a permanent magnet.
III. The strength of the magnetic field of an electromagnet can be adjusted easily.
IV. Electromagnet can produce electromagnetic wave.

Choice 1 I and II only
Choice 2 I and III only
Choice 3 I, III and IV only
Choice 4 III and IV only

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11. The figure shows two iron rods is placed in a solenoid. What will happen when current is allow to flows in the solenoid?
Choice 1 The two iron rods repel each other.
Choice 2 The two iron rods attract each other.
Choice 3 The two iron rods vibrate in the solenoid.
Choice 4 None of the above answers is correct.

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electromagnetism notes