Forces Chapter 7 Question Preview (ID: 35328)
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What is electromagnetic induction?
a) Is creates electric current through motion of a magnetic field. In transformers, AC switches from one coil to another.
b) Is creates electric current through motion of a magnetic field. In transformers, DC switches from one coil to another.
c) Is creates electric current through motion of a electric field. In transformers, AC switches from one coil to another.
d) Is creates electric current through motion of a electric field. In transformers, DC switches from one coil to another.
Magnets are attract to what metal?
a) Iron
b) Gold
c) Silver
d) Cobalt
What acts as a giant magnet?
a) Earth
b) Moon
c) Mars
d) Sun
An alternating currents is induced when a wire moves up or down repeatedly in a what?
a) Magnetic Field
b) Current
c) Field Lines
d) Magnet
What does a step-up transformer increase?
a) Voltage
b) Amperage
c) Noise
d) Movement
What's a strong magnet that can be turned on and off?
a) Electromagnet
b) Current
c) Switch
d) Motor
Where is the magnetic effect the strongest?
a) At it's poles
b) In the middle
c) North Pole
d) South Pole
A galvanometer is a device that measures small what?
a) currents
b) magnetic field lines
c) magnetism
d) electricity
A maglev (monorail) train floats above its rails due to what?
a) Magnetism
b) Currents
c) Magnetic Field Lines
d) Electricity
How is electric current from a generating plant transmitted?
a) Through alternating current transmitted at high voltages, but usually used at low voltages
b) Through direct current transmitted at high voltages, but usually used at low voltages
c) Through alternating current transmitted at low voltages, but usually used at high voltages
d) Through direct current transmitted at low voltages, but usually used at high voltages
A magnetic field is produced when there is what?
a) Electric current
b) Magnet
c) Battery
d) Strong magnets
As Earth's magnetic poles move, the magnetic declination in a given location will do what?
a) Change
b) Stay the same
c) Move towards the east
d) Move towards the west
If you use a stronger ferromagnet (nail) in the core, you will increase what?
a) The strength of an electromagnet
b) The strength of a magnet
c) The strength of a clock
d) The strength of electricity
Which of the following uses direct current?
a) Battery
b) Microwave
c) Refrigerator
d) TV
To change the direction of current in a motor, current is conducted
a) through the brushes to the commutator.
b) through the armature.
c) in the direction of rotation.
d) by the field lines.
In a bar magnet spreads out from one pole and curve around to the other?
a) Magnetic field lines
b) Electromagnetic field lines
c) Field Lines
d) Electricity Lines
What does every magnet have ?
a) Magnetic Poles
b) Silver
c) Positive and negative end
d) New and old end
When magnet poles are unlike they?
a) Repel
b) Attract
c) Don't do anything
d) Move together
The armature spins continuously in a what?
a) Electric Motor
b) Galvanometer
c) Battery
d) Magnet
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