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- 1. Multiple Choice
Why might a current-carrying wire be placed between a magnetic field?
To increase the current from the interaction of magnetic fields
To increase the voltage from the interaction of magnetic fields
To produce a force from the interaction of magnetic fields
- 2. Multiple Choice
What does the thumb indicate in flemings left hand rule?
Force
Motion
Current
Magnetic field direction
- 3. Multiple Choice
What direction is the force/motion in the following diagram?
Perpendicular to the magnets
Downwards
Parallel and through the magnets
- 4. Multiple Choice
What angle must there be between a magnetic field and a conductor in order for the maximum force to be exerted?
180
45
90
270
- 5. Multiple Choice
Name one factor that does not affect the size of a force in on a current-carrying conductor placed in a magnetic field?
Gravity
Magnetic flux density/size of magnetic field
Size of the current
Length of the conductor
- 6. Multiple Choice
A 20 cm section of wire with a current of 8 A is at 90 degrees to a 0.1 T magnetic field. What direction is the force and calculate the size of it?
up, 0.1 x 8 A x 20 cm = 16 N
down, 0.1 x 8 A x 20 cm = 16 N
down, 0.1 x 8 A x 0.20 m = 0.16 N
up, 0.1 x 8 A x 0.20 m = 0.16 N
- 7. Multiple Choice
Name the effect that causes a coil of current-carrying wire in an electric motor to move.
The electromagnetism effect
The magnetic effect
The motor effect
- 8. Multiple Choice
Which rule can be used to work out which way a coil of wire rotates in a motor?
Fleming's left-hand rule
Fleming's right-hand rule
- 9. Multiple Choice
Give two ways you can reverse the direction of a basic dc motor?
Reverse the current
Keep the current the same
Reverse the magnetic field
Keep the magnetic field the same
- 10. Multiple Choice
How does a split ring commutator work?
Swaps the contact evert full turn, so that the left-hand and right-hand arms of the coil always experience a force in the same direction.
Swaps the contact evert half turn, so that the left-hand and right-hand arms of the coil do not experience a force in the same direction.
Swaps the contact evert half turn, so that the left-hand and right-hand arms of the coil always experience a force in the same direction.
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