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- 1. Multiple Choice
Magnetic field lines should NEVER be __________.
pointing from North to South
crossing each other
symmetrical
close together
- 2. Multiple Choice
The diagram shows the application of __________.
Fleming's Left-Hand Rule
Fleming's Right-Hand Rule
Left-Hand Grip Rule
Right-Hand Grip Rule
- 3. Multiple Choice
When using the Right-Hand Grip Rule for an iron bar placed in a d.c. solenoid, the thumb represents the _____.
North pole
motion
current direction
magnetic field direction
- 4. Multiple Choice
When using the Right-Hand Grip Rule around a current-carrying wire, the thumb represents the _____.
North pole
motion
current direction
magnetic field direction
- 5. Multiple Choice
The diagram shows a magnetic field around a current flowing out of this screen. The _____ has been drawn WRONGLY.
current direction
magnetic field direction
distance between field lines
symbol for the current
- 6. Multiple Choice
The compasses will all point _____ when an downward current flows in the wire.
clockwise
anticlockwise
left
right
- 7. Multiple Choice
The diagram shows that __________.
like currents attract
like currents repel
unlike currents attract
unlike currents repel
- 8. Multiple Choice
The proton enters the magnetic field and moves __________.
up in a straight path
down in a straight path
up in a curved path
down in a curved path
- 9. Multiple Choice
When applying the Fleming's Left-Hand Rule, X represents the _____.
North pole
current direction
magnetic field direction
magnetic force direction
- 10. Multiple Choice
When applying the Fleming's Left-Hand Rule, Y represents the _____.
North pole
current direction
magnetic field direction
magnetic force direction
- 11. Multiple Choice
The purpose of _____ in a d.c. motor is to reverse the current direction at every half a revolution.
carbon brushes
a commutator
a rectangular coil
a rheostat
- 12. Multiple Choice
The purpose of _____ in a d.c. motor is to prevent overheating.
carbon brushes
a commutator
a rectangular coil
a rheostat
- 13. Multiple Choice
When connected to a current flowing from A to B to C to D, ABCD will _____.
rotate clockwise
rotate anticlockwise
move up
move down
- 14. Multiple Choice
The speed of rotation of a d.c. motor CANNOT be increased by _____.
placing a soft iron core
increasing the number of coils
increasing the current in the coil
increasing the resistance of the coil
- 15. Multiple Choice
The motor effect requires __________.
an electrostatic field and an electric current
an electric current and a magnetic field
a magnetic field and an electrostatic field
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