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- 1. Multiple ChoiceWhat is an electromagnet?a temporary magnet made from current carrying wire around a magnetic metal core.a permanent magnet with a north and south pole
- 2. Multiple ChoiceWhat makes an electromagnet stronger?Increase the number of wire wraps around the iron coredecrease the strength of the power sourceremove the source of currentlightning bolts hitting a tree
- 3. Multiple ChoiceWhat is the relationship between electrical current and magnetic field strength in an electromagnet?When current is increased, magnetic field strength increasesWhen current is increased the strength of magnetic field decreases
- 4. Multiple Choice
This 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. - 5. Multiple ChoiceWhich of the following is NOT part of an electromagnet?WireIronToothpickPower source
- 6. Multiple ChoiceWhich of the following is shown in the picture?ElectromagnetElectric generatorElectric motorTransformer
- 7. Multiple ChoiceHow are electromagnets different from magnets?magnets can be turned on/offyou can turn an electromagnet on/offmagnets are more powerfulmagnets have a North and South pole
- 8. Multiple ChoiceWhat is magnetism?Energy created by magnetsA force created by magnetsA contact forceAn invisible force that attracts electrically charged particles
- 9. Multiple ChoiceWhat are the ends of a magnet called?East and west polesLeft and Right endsNorth and South endsNorth and South poles
- 10. Multiple ChoiceWhat is the name of the force that attracts or repels materials?currentelectricitymagnetism
- 11. Multiple ChoiceSurrounding every magnet is a __________ __________.magnetic fieldelectrical currentanother magnet
- 12. Multiple ChoiceIf I were to try to connect the North pole of one magnet to the North pole of another magnet, the two poles would:attractrepelneither
- 13. Multiple ChoiceIf I were to try to connect the North pole of one magnet to the South pole of another magnet, the two poles would:attractrepelneither
- 14. 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, wire
- 15. Multiple ChoiceWhat kind of magnet can be turned on and off?refridgerator magnetelectromagnetmagnetiteiron
- 16. Multiple ChoiceWhat happens when a wire is wound into a coil around an iron core in an electromagnet?the wire exolodesyou get electricutedthe magnetic field becomes strongerthe magnetic field becomes weaker
- 17. Multiple ChoiceWhile electric current is flowing through a wire, what surrounds the wire?a magnetic fielda glowing lightneutronsprotons
- 18. Multiple ChoiceWhen two magnets attract, they ______________push apartchange colorget colderpull together
- 19. Multiple ChoiceWhen two magnets repel, they ________________change colorpull togetherpush apartget colder
- 20. Multiple ChoiceOpposite magnetic forces _____ each other.AttractRepel
- 21. Multiple ChoiceA north pole and a south pole will attract.TrueFalse
- 22. Multiple ChoiceIn order to make an electromagnet, you need abattery, nail, and magnetbattery, wire, and nailmagnet, nail, and wireall of the above
- 23. Multiple ChoiceWhat is the metal center of an electromagnet called?The currentThe wireThe coilThe core
- 24. Multiple ChoiceWhat is needed to make a simple electromagnet?soundwiremagnetslight energy
- 25. Multiple ChoiceWhat would increase the strength of an electromagnet?Increasing the amount of current flowing through the wire.Inserting a wooden core inside the coilChanging the direction of the currentDecreasing the number of coils of wire
- 26. Multiple ChoiceA simple electromagnet can be constructed using a battery, a piece of insulated wire, and some kind of iron core, such as a nail.
When the current is turned off in an electromagnet, the _____________.battery short-circuitsmagnetic field is weakenedwire gains a positive chargecore becomes more magnetic - 27. Multiple ChoiceA simple electromagnet can be constructed using a battery, a piece of insulated wire, and some kind of iron core, such as a nail.
The strength of magnetic force in an electromagnet is ______ by increasing the current through the coil.increasedunaffectedeliminateddecreased - 28. Multiple ChoiceA simple electromagnet can be constructed using a battery, a piece of insulated wire, and some kind of iron core, such as a nail.
The strength of magnetic force in an electromagnet is ______ by decreasing the number of coils.increasedunaffectedeliminateddecreased - 29. Multiple ChoiceA simple electromagnet can be constructed using a battery, a piece of insulated wire, and some kind of iron core, such as a nail.
The strength of magnetic force in an electromagnet is ______ by increasing the number of coils.increasedunaffectedeliminateddecreased - 30. Multiple ChoiceIf the direction of current in a wire is reversed the magnetic field will?continue in the same directionbecome weakerchange directionbecome stronger
- 31. Multiple ChoiceYou can make an electromagnet stronger by: having a __________________ current in the wiresmallerlargergreenerwater
- 32. Multiple ChoiceYou can make an electromagnet stronger by: using a __________________ material for the core.softconductingmagnetichard
- 33. Multiple ChoiceWhat would happen if you broke a magnet in half?NothingYou would have two new pieces which would have a north and south poleNeither pole would be magnetic anymoreYou would have two magnets, one with only a north pole and the other with only a south pole
- 34. Multiple ChoiceThe strength of the magnetic field of a electromagnet can be increased byDecreasing the number of coils.Increasing the number of coilsDecreasing the currentIncreasing the resistance
- 35. Multiple ChoiceWhat will happen when these magnets are brought close together?They will attract each other.They will repel each other.Both magnets will turn to the leftBoth magnets will turn to the right
- 36. Multiple ChoiceWhich of the following is true of a bar magnet?Its magnetic field is strongest near its center.It is surrounded by a magnetic field.The north pole is stronger than the south pole.The south pole is stronger than the north pole.
- 37. Multiple ChoiceThe area surrounding a magnet that is affected by the magnet's force is called a ____________.Magnetic FieldMagnetic AreaMagnetic SpaceMagnetic Range
- 38. Multiple ChoiceWhat happens when a wire is wound into a coil around an iron core in an electromagnet?the wire exolodesyou get electrocutedthe magnetic field becomes strongerthe magnetic field becomes weaker
- 39. Multiple ChoiceWhat is an electromagnet?a magnet that creates an electric currenta magnet created by an electric currenta magnet that has an electric chargean electric charge that is magnetic
- 40. Multiple Choice___ Law says that the Induced current is proportional to the change of magnetic fluxLenz'Faraday'sAmpere's
- 41. Multiple Choice
Which description best applies to Lenz's Law?
An induced current occurs when a magnet passes through a tube.
When a change in magnetic field occurs to a coil the direction of current goes in the in the other direction to this change.
The direction of an induced current is such to align with the change that created it.
A magnet is a tube is always slowed by its magnetic field.
- 42. Multiple Choice
Which activity will produce the highest current?
Move the magnet bar into the coil while the coil remains stationery
Move the coil into the magnet bar while the magnet remains stationery
Move the coil and magnet towards each other
Move the coil and magnet away from each other
- 43. Multiple ChoiceThe voltmeter is at 0 in this image. How would you manipulate the experiment to create electricity (measured in volts)?Flip the magnet around so the North pole is facing outMove the magnet back and forthTake the magnet outAdd more coils around the paper cylinder
- 44. Multiple ChoiceWhat is one way to increase the current in a wire?Decrease the number of coilsIncrease the number of coilsMove the magnet slowerTake the wire off of the magnet
- 45. 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
- 46. Multiple ChoiceWhat benefit is gained by the addition of the iron core in an electromagnet?It makes a strong magnet weakerIt makes a weak magnet strongerThere is no benefit at allIt lets currents interact with each other
- 47. Multiple Choice
Find the direction of the magnetic force.
Into the screen
Out of the screen
Right
Left
- 48. Multiple Choice
Find the direction of the magnetic force.
Down
Into the screen
Out of the screen
Up
- 49. Multiple Choice13.7 Based on this picture, which side will have a higher voltage?SecondaryPrimaryBoth sides have the same voltageCannot be determined
- 50. Multiple ChoiceElectromagnetic induction is change in ___________________.surface areamagnetic polesmagnetic flux
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