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Science
8th
grade
Chapter 20 Lesson 2 Making Magnets with an Electric Current
33 questions
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- 1. Multiple Choice
Electronic devices create magnetic fields because they
are magnets
are compasses
have moving particles with electric charge
- 2. Multiple Choice
How can you test to see if there is a current running through a wire?
listen carefully to see if you hear a buzzing sound
place several compasses around the wire
place several batteries around the wire
- 3. 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
- 4. Multiple Choice
What THREE ways are electromagnets different from permanent magnets?
they can be turned off and on
they can increase in strength by increasing the current in the wire
they are smaller in size
they can change which is the north and south pole
- 5. Multiple Choice
Electromagnets are useful in industry such as a junk yard because they
have strong north and south poles
are easy to lift
can be turned off and on
- 6. Multiple Choice
Permanent Magnets and Electromagnets are similar in which TWO ways?
it can be turned off and on
they both have a north and south pole
they are surrounded by a magnetic field
- 7. Multiple Choice
Increasing the number of coils in an electromagnet will _________ the strength of the magnet.
decrease
increase
not affect
- 8. Multiple Choice
An electric current produces
a magnetic field.
an electromagnet.
a solenoid.
an insulator.
- 9. Multiple ChoiceWhat device is made of coils of wire with an electrical current passing through it in order to generate a magnetic field?ElectromagnetGeneratorElectron MagnetMotor
- 10. 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
- 11. Multiple ChoiceTrue or False: A magnetic field is invisible.TrueFalse
- 12. Multiple ChoiceWhat is the device seen here?generatorelectric motorelectromagnetmagnet
- 13. Multiple Choice
The field around the wire becomes ______ if the current in the wire increases.
stronger
weaker
- 14. Multiple Choice
A(n) ______ is a device that uses an electric current to produce motion.
generator
electric motor
electromagnet
magnet
- 15. Multiple Choice
When a(n) ______ is supplied to the motor, the unlike poles of the permanent magnet and the electromagnet attract each other, causing the motor to turn.
magnetic force
electric current
commutator
magnet
- 16. Multiple ChoiceWhat is the name of a magnet created by wrapping a current-carrying wire around a ferromagnetic core?ElectromagnetMagnetic PoleVoltageElectric Current
- 17. Multiple ChoiceAny attraction or repulsion between magnets is called...Electric ResistanceElectric CurrentMagnetic ForceVoltage
- 18. Multiple ChoiceWhat can you use to make an electromagnet?Battery, nail and stringBattery, pencil and wireWire, battery and iron ore (nail)Peanut butter, lampshade, hand sanitizer
- 19. Multiple ChoiceWhen two magnets attract, they ______________push apartchange colorget colderpull together
- 20. Multiple ChoiceWhen two magnets repel, they ________________change colorpull togetherpush apartget colder
- 21. Multiple ChoiceIf you hold two magnets with the same poles (N to N, or S to S) together, the magnets will ___.attract each othercancel each other's magnetic fieldboth point to Earth's North Polerepel each other
- 22. Multiple ChoiceWhat is the name for any object that attracts the metal iron?MagnetCircuitConductorInsulator
- 23. Multiple ChoiceMagnets have a north and a south ___________shapecolorpoleregion
- 24. Multiple ChoiceWhat would we call a nail that can pick up a paperclip because it is touching a magnet?temporary magnetpolesforcedetector
- 25. Multiple ChoiceA circuit MUST be _______ in order for the current to flowopenclosed
- 26. Multiple Choice
The geographical and magnetic poles are in the same place.
True
False
- 27. Multiple Choice
Magnetic poles have magnetic field lines that start at the ______ magnetic pole and end at the ________ magnetic pole.
north, south
south, north
north, north
south, south
- 28. Multiple ChoiceThe relationship between electricity and magnetism is calledscarymagnet role reversalelectromagnetismmagneteel
- 29. Multiple ChoiceWhen magnetic field lines are drawn, how do they look?straight linescriss-crossed lines like X'scurved lines from N to S pole and outwardslines extending outward in all directions like drawing the Sun
- 30. Multiple ChoiceWhat is the role of the ferromagnetic core in an electromagnet?It changes the direction of the currentIt increases the strength of the electromagnetIt turns the magnetic field on and offIt closes an electrical circuit in the electromanget
- 31. Multiple ChoiceElectric motors use _____ to turn electricity into motion.magnetswiresbatteries
- 32. Multiple ChoiceWhich image would produce a stronger electromagnet?50 coils100 coils150 coils200 coils
- 33. Multiple Choice
What are the 3 ferromagnetic elements?
copper, nickel, iron
iron, aluminum, copper
nickel, iron, cobalt
iron, cobalt, copper
- Answer choicesTagsAnswer choicesTags