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49 questions
When _______________ travels through a
conductor, a magnetic field is created
current
a magnetic field
neutrons
Electric currents produce _____________
electron clouds
magnetic fields
sound waves
In magnets and electromagnets, similar poles attract
true
false
In magnets and electromagnets, dissimilar (opposite) poles attract
true
false
In a battery, electrons collect at the __________________ end of the battery.
positive
middle
negative
Electrons which collect at the negative end of the battery, can flow to the positive end through a ___________________
wire
electron cloud
magnet
When the strength of the magnetic field changes, the ________________________between the coil and the permanent magnet changes.
attractive force
polarity
wire
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
A compass needle shows us the magnetic field of
the sun
Earth
the moon
a magnet that is near by
Earth has a magnetic field that is similar to a bar magnet's magnetic field.
true
false
Earth's magnetic South Pole is near Earth's geographic North Pole
true
false
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
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.
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.
Which object(s) have electric fields?
Electric Charges
Magnets
Both Electric Charges & Magnets
Electric fields do not exist
Which object(s) have magnetic fields?
Electric Charges
Magnets
Both Electric Charges & Magnets
Magnetic fields do not exist
A(n) ___ converts electricity into magnetism.
electric transformer
electric generator
electromagnet
electric motor
A(n) ___ converts magnetism into electricity.
electric transformer
electric generator
electromagnet
electric motor
Electric charges must ___ in order to create an observable magnetic field.
exist
be moving
be stationary
disappear
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
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
The ___ coils a wire has the ___ current is able to be generated.
more; more
less; more
more; less
less; less
The production of electric current by a changing magnetic field is called ____________________________________.
induced current
electromotive force
electromagnetic induction
internal resistance
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
What type of process is shown?
Electromagnet
Electric motor
Electric generator
Electromagnetic induction
In electromagnetic induction, what is being created?
Magnetism
Electrical energy
Mechanical energy
Chemical energy
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
If the direction of motion is reversed, the direction of the current...
reverses
stays the same
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
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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