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Application of Catapult Force
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.
Choose the best answer.
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.
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.
Choose the best answer.
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.
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.
Choose the best answer.
3. In a direct current motor, the current in the coil changes direction every half rotation. This is done by
Choose the best answer.
4. In a direct current motor, the current in the coil changes direction every half revolution. The reason of doing so is
Choose the best answer.
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?
Magnetic Field
A magnetic field is a region in the surrounding of a magnet which a magnetic material experiences a detectable force.
A magnetic field is a region in the surrounding of a magnet which a magnetic material experiences a detectable force.
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