Electromagnets
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16 QuestionsShow answers
  • Question 1
    900 seconds
    Q.

    A magnetic field is a force field created by

    answer choices

    gravity

    force

    magnets

  • Question 2
    900 seconds
    Q.

    Arrows are close together on a force field when the force is

    answer choices

    stronger

    weaker

    opposite

  • Question 3
    900 seconds
    Q.

    A compass needle shows us the magnetic field of

    answer choices

    the sun

    Earth

    the moon

    a magnet that is near by

  • Question 4
    900 seconds
    Q.

    Earth has a magnetic field that is similar to a bar magnet's magnetic field.

    answer choices

    true

    false

  • Question 5
    900 seconds
    Q.

    Earth's magnetic South Pole is near Earth's geographic North Pole

    answer choices

    true

    false

  • Question 6
    900 seconds
    Q.

    Electronic devices create magnetic fields because they

    answer choices

    are magnets

    are compasses

    have moving particles with electric charge

  • Question 7
    900 seconds
    Q.

    A compass needle points north because of Earth's magnetic field unless

    answer choices

    it is close to a wire with a current

    it is close to any wire

    it is close to a battery

  • Question 8
    900 seconds
    Q.

    How can you test to see if there is a current running through a wire?

    answer choices

    listen carefully to see if you hear a buzzing sound

    place several compasses around the wire

    place several batteries around the wire

  • Question 9
    900 seconds
    Q.

    The compass needles are turned by magnetic forces caused by electric current. The magnetic forces caused by an electric current are one kind of

    answer choices

    gravitational force

    gravitational field

    electromagnetic force

  • Question 10
    900 seconds
    Q.

    The electromagnetic forces from a current carrying wire are strong enough to move the compass needle. The forces can be made stronger by

    answer choices

    making the wire shorter

    making the wire longer

    making the wire into loops

  • Question 11
    900 seconds
    Q.

    An electromagnet is a magnet that

    answer choices

    its strength can be varied and turned on and off

    always has a magnetic field around it

    has very little strength

  • Question 12
    900 seconds
    Q.

    Refrigerator magnets and bar magnets are what type of magnet?

    answer choices

    electromagnet

    electronic

    permanent

  • Question 13
    900 seconds
    Q.

    What THREE ways are electromagnets different from permanent magnets?

    answer choices

    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

  • Question 14
    900 seconds
    Q.

    Electromagnets are useful in industry such as a junk yard because they

    answer choices

    have strong north and south poles

    are easy to lift

    can be turned off and on

  • Question 15
    900 seconds
    Q.

    Permanent Magnets and Electromagnets are similar in which TWO ways?

    answer choices

    it can be turned off and on

    they both have a north and south pole

    they are surrounded by a magnetic field

  • Question 16
    900 seconds
    Q.

    A force that can act at a distance is called

    answer choices

    non contact force

    friction

    balanced

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