1. In what direction will the force act in this system?Up
Down
Left
Right
Into the page
Out of the page I B
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2. A step-up transformer (choose all that apply)
decreases voltage
increases voltage
is used at a power plant
is used near homes
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3. Predict the direction of the force on the negatively charged particle below.up
down
right
left
into page
out of page X - q v
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4. What type of interaction do these two wires experience?
Attraction
Repulsion
No interaction I
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5. Which end of the electromagnet is the North Pole
top
bottom
There is no North pole
Battery - +
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6. What direction is the EMF induced in the wire below?v Up
Right
Down
Left
None of these
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7. A transformer can work on …
Direct current only
Direct or alternating current
Alternating current only
Current doesn’t make a transformer work
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8. The direction of the earth’s magnetic field lines is …
From geographic South to North
From geographic North to South
Parallel to the equator from East to West
Magnetic field lines don’t have direction
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9. The source of all magnetism is …
Iron ore
magnetrons
cobalt
Moving electric charges
None of the above
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10. Which statements are true of electromagnets. (Choose all that apply)
They are permanent magnets
They have north and south poles
They are stronger if there is less current
They are stronger if there are more coils
The poles switch if the current changes directions
None of these are true statements
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11. Choose all true statements about current carrying wires.
A magnetic field forms around the wires when there is current present
The magnetic field lines form concentric circles around the wire
The direction of the magnetic field lines can be predicted with a right hand rule
The magnetic field strength decreases as distance from the wire increases.
None of these statements are true.
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12. The magnetic field strength is altered An EMF is induced
When a conductor is moved through a magnetic field so that it cuts across field lines...
The magnetic field strength is altered
An EMF is induced
A resistance is induced
An electromagnet is created
None of these
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13. Which of the following describes a motor. (Choose all that apply)
Made of a coil of wire spinning in a magnetic field
Requires an external force to spin the armature
Converts mechanical energy to electrical energy
Converts electrical energy to mechanical energy
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14. Which of the following describes a generator. (Choose all that apply)
Made of a coil of wire spinning in a magnetic field
Requires an external force to spin the armature
Converts mechanical energy to electrical energy
Converts electrical energy to mechanical energy
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15. What does EMF stand for? Electromagnetic force Electromotive force
Electromagnets freeze
None of these
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16. What units are used to measure magnetic field strength?
Volts
Nickels
Metallicas
Joules
Teslas
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