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- 1. Multiple ChoiceWhat component becomes a temporary magnet when electricity is flowing through the circuit?d -cellwire coilswitchcore
- 2. Multiple ChoiceWhat component provides the pathway to carry electricity from component to component?d cellwireswitchwire coil
- 3. Multiple ChoiceWhich component controls the flow of electricity by opening and closing the circuit?switchd cellwire coilcore
- 4. Multiple ChoiceWhich component provides the stored energy to run the electromagnet?d cellcorecoilwire
- 5. Multiple ChoiceSamuel Morse, the inventor of the telegraph had a problem. How can he increase the strength of the electromagnet in his telegraph?use thinner wireadd more d-cellsadd a switchwind fewer wraps of wire around core
- 6. Multiple Choice
When _______________ travels through a
conductor, a magnetic field is created
current
a magnetic field
neutrons
- 7. Multiple Choice
Electric currents produce _____________
electron clouds
magnetic fields
sound waves
- 8. Multiple Choice
In magnets and electromagnets, similar poles attract
true
false
- 9. Multiple Choice
In magnets and electromagnets, dissimilar (opposite) poles attract
true
false
- 10. Multiple Choice
In a battery, electrons collect at the __________________ end of the battery.
positive
middle
negative
- 11. Multiple Choice
Electrons which collect at the negative end of the battery, can flow to the positive end through a ___________________
wire
electron cloud
magnet
- 12. Multiple Choice
When the strength of the magnetic field changes, the ________________________between the coil and the permanent magnet changes.
attractive force
polarity
wire
- 13. Multiple Choice
How can the strength of an electromagnet be increased? (mark all that apply)
increase the current flowing through the coil
increase the number of coils
add an amplifier to it
put iron core inside the coil
- 14. Multiple Choice
What effect will the south pole of one magnet have on the south pole of another magnet?RepulsiveAttractiveCombativeNo effect - 15. Multiple ChoiceThis is a picture of a simple electromagnet. How can the electromagnet be made stronger?Add more coils of wire to the nail.Use a smaller battery.Reverse the poles of the magnet.Remove all the coils and the nail.
- 16. Multiple ChoiceSurrounding every magnet is a __________ __________.magnetic fieldelectrical currentanother magnetan enemy
- 17. Multiple ChoiceIn order for an electromagnet to be formed, an __________ current must pass through a coil of __________ wrapped around an ________ core.wire, iron, electricelectric, wire, ironiron, electric, wireexcited, hair, apple
- 18. Multiple ChoiceWhat is most likely to happen when the switch is closed?A magnetic field should be producedThe nail will rustThe battery will explodeThe wire will catch on fire
- 19. Multiple ChoiceWhat are the ends of a magnet called?East and west polesLeft and Right endsNorth and South endsNorth and South poles
- 20. Multiple ChoiceThe attraction or repulsion created by spinning electric charges is called -A. electric generatorB. magnetic forceC. solenoidD. electromagnet
- 21. Multiple ChoiceA compass needle responds to a magnetic field, because the compass needle is aA. generator.B. motor.C. magnet.D. transformer.
- 22. Multiple ChoiceWhere does a magnetic field occur in relation to an electrified wire?At either end, but not in the middleOnly the side closest to sourceAround the entire length of wireOnly the side furthest from source
- 23. Multiple Choice
A compass needle shows us the magnetic field of
the sun
Earth
the moon
a magnet that is near by
- 24. Multiple Choice
Earth has a magnetic field that is similar to a bar magnet's magnetic field.
true
false
- 25. Multiple Choice
Earth's magnetic South Pole is near Earth's geographic North Pole
true
false
- 26. Multiple Choice
The electromagnetic forces from a current carrying wire are strong enough to move the compass needle. The forces can be made stronger by
making the wire shorter
making the wire longer
making the wire into loops
- 27. Multiple ChoiceWhat kind of magnet can be turned on and off?refridgerator magnetelectromagnetmagnetiteiron
- 28. Multiple Choice
What is the role of the battery in the electromagnet?
It provides light energy for the electromagnet.
It provides magnetic field for the electromagnet.
It provides sound energy for the electromagnet.
It provides the power source for the electromagnet.
- 29. Multiple Choice
What would happen if you took one end of the wire off the battery?
The nail will be a magnet.
The nail would no longer be a magnet
Nothing will happened.
The nail will heats up.
- 30. Multiple ChoiceThe arrow on magnetic field lines shows them flowing in which direction?Left to RightNorth to SouthSouth to NorthRight to Left
- 31. Multiple ChoiceWhat is one difference between electromagnets and bar magnets?Bar magnets can be turned off but electromagnets cannotElectromagnets need electricity but bar magnets do notBar magnets have a magnetic field but electromagnets do notBar magnets are bigger than electromagnets
- 32. Multiple Choice
Which object(s) have electric fields?
Electric Charges
Magnets
Both Electric Charges & Magnets
Electric fields do not exist
- 33. Multiple Choice
Which object(s) have magnetic fields?
Electric Charges
Magnets
Both Electric Charges & Magnets
Magnetic fields do not exist
- 34. Multiple Choice
A(n) ___ converts electricity into magnetism.
electric transformer
electric generator
electromagnet
electric motor
- 35. Multiple Choice
A(n) ___ converts magnetism into electricity.
electric transformer
electric generator
electromagnet
electric motor
- 36. Multiple Choice
Electric charges must ___ in order to create an observable magnetic field.
exist
be moving
be stationary
disappear
- 37. Multiple Choice
Which of the following will increase the strength of an electromagnet?
Use a Bigger Battery (More Current)
Wrap More Coils
Insert an Iron Core
Use a Bigger Magnet
- 38. Multiple Choice
What must occur for a magnetic field to induce an electric current?
The magnetic field must be really big
The magnetic field must be stable
The magnetic field must be changing
The magnetic field must be from a permanent magnet
- 39. Multiple Choice
The ___ coils a wire has the ___ current is able to be generated.
more; more
less; more
more; less
less; less
- 40. Multiple Choice
The production of electric current by a changing magnetic field is called ____________________________________.
induced current
electromotive force
electromagnetic induction
internal resistance
- 41. Multiple ChoiceWhat would happen if I move a bar magnet in and out of a coil of copper wire?Electric current would disappearThe magnet would explodeElectric current will flow through the wireIt would produce a gravitational field
- 42. Multiple Choice
Which action will increase the deflection of the galvanometer pointer?
The magnetic pole is reversed
The number of turns of coils is increased
The coil is made from insulated wire
The magnet is slowly pushed into the coil
- 43. Multiple ChoiceHow could the experimenter increase the amount of electricity being induced by this experiment?Increase the number of coilsDecrease the number of coilsFlip the magnet aroundNothing, the amount of electricity cannot be increased
- 44. Multiple Choice
What type of process is shown?
Electromagnet
Electric motor
Electric generator
Electromagnetic induction
- 45. Multiple Choice
In electromagnetic induction, what is being created?
Magnetism
Electrical energy
Mechanical energy
Chemical energy
- 46. Multiple Choice
Can you produce current in a wire with a magnet that is sitting still?
Yes; having a magnet near a wire is enough to excite the electrons
No; the magnetic field has to be changing to excite the electrons
No; magnets cannot create electricity
- 47. Multiple Choice
If the direction of motion is reversed, the direction of the current...
reverses
stays the same
- 48. Multiple Choice
What benefit is gained by the addition of the iron core in an electromagnet?
It makes a strong magnet weaker
It makes a weak magnet stronger
There is no benefit at all
It lets currents interact with each other
- 49. Multiple Choice
Electromagnetism is when
magnetism causes electricity
electricity causes magnetism
electricity and magnetism cancel each other out
a strong magnet creates a permanent magnet
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