# 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

The SPM Physics Workbook is developed under the One-School.net Free Books Project. The content of this book is strictly follow Malaysia SPM (Sijil Pelajaran Malaysia) syllabus. The aim of this project is to provide a complete electronic supplementary network for students to develop self-learning skills by breaking the spoon-feed rituals and to encourage them to compile educational information from the Internet.
1. Which of the following materials is most likely to be used for the coil of an electromagnet?
Copper
Steel
Iron
Silver

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

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.

I and III only
I, II and III only
I, II and IV only
III and IV only

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

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

6. The figure shows a picture of solenoid. State the magnetic pole at X when the switch is closed.
North
South
Can be North or South, depends on the material of the core.

7. The figure shows two solenoids are placed near each other. What will happen if the switches are switched on?
The two solenoids will repel each other.
The two solenoids will attract each other.
The two solenoids will charge each other.
The two solenoids will rotate.

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.

I and II only
I and III
I, III and IV only
I, II and III only

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?
Soft iron
Steel
Zinc
Copper

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.

I and II only
I and III only
I, III and IV only
III and IV only

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