Page 158 - Physics Form 5 KSSM_Neat

4. Sketch the design of a homopolar motor.
5. Construct the homopolar motor according to the suggested design.
6. Operate the homopolar motor that you have constructed. History
7. Observe the rotation produced and identify the aspects of the In the year 1821, Michael
design that need to be improved. Faraday constructed and
demonstrated the operation
KEMENTERIAN PENDIDIKAN MALAYSIA
8. Discuss the steps of improvement that can be carried out.
of a homopolar motor at the
9. Improve the homopolar motor if necessary and test the rotation. Royal Institute, London.
10. Based on your experience in designing and constructing the
homopolar motor, discuss ways to construct a more efficient
motor at a low cost.
11. Present the outcome.

Formative Practice 4.1

1. With the aid of a labelled diagram, explain the meaning of catapult field.

2. Figure 4.15 shows the arrangement of apparatus to study the effect of a force on a
current-carrying conductor.

To current
supply
Magnadur magnet
–
S
Y +

X
N Track

Copper rod

Figure 4.15
(a) What is the direction of the current in the copper wire XY when the switch of the direct
current power supply is turned on?
(b) Explain the motion of the copper wire XY and state the direction of the motion.

3. State three factors that affect the speed of rotation of a motor.
4. (a) Compare and contrast the structure of a brushed motor with a brushless motor.
(b) State two advantages of brushless motor compared to brushed motor.

148 LS 4.1.6