WorksheetsMagnetism
Total questions: 40
Worksheet time: 25mins
What is represented by the curved lines surrounding the magnet in this image?
magnetic poles
magnetic field
magnetic domain
electron movement
North poles of magnets always attract which?
south poles
other north poles
positive charges
negative charges
What happens if a metal bar magnet is broken into four pieces?
The pieces will not be magnets.
Two pieces will be magnets and two will not.
Each piece will be a magnet with a north pole and a south pole.
Two pieces will have only north poles and two will have only south poles.
Which of the following is a ferromagnetic element?
nickel
glass
plastic
carbon
Why doesn't an iron nail behave like a magnet?
its magnetic domains are aligned
it contains too few magnetic domains
its magnetic domains are usually arranged randomly
the atoms in the iron exert a force on all the other atoms
What produces the magnetic field represented by the green lines in this image?
spinning neutrons
moving electric charges
magnetic field lines
potential energy of molecules
What happens when a magnet comes near a loose wire through which current is flowing?
the current stops flowing
the current changes direction
the poles on the magnet reverse
the magnet causes the wire to move
How does coiling a current-carrying wire affect the magnetic field around it?
it increases the magnetic field by causing more current to flow
it increases the magnetic field by aligning the fields at multiple points on the wire
it decreases the magnetic field by slowing down the current in the wire
it decreases the magnetic field by causing the fields at multiple points on the wire to cancel each other out
How is the strength of an electromagnet changed while in use in a device like the one shown here?
by turning it on and off
by moving the ferromagnetic core
by changing the current through the wire
by changing the number of coils in the wire
Which is the device that reverses the electric current through the electromagnet in an electric motor?
a shaft
a temporary magnet
a commutator
a ferromagnetic core
What is occurring in the image shown here?
the motion of a wire coil through a magnetic field is producing electric current in the wire
a magnet is causing a coil of wire to move because current is flowing through it
a battery is sending current through a wire, causing it to move in the magnetic field
a magnet is being pulled apart, causing a wire coil to be pulled down by gravity
What is direct current?
current that is of a constant voltage
current that does not encounter any resistance
current that flows in only one direction
current that is generated in the same location where it is used
What does a transformer do?
change the orientation of a magnetic field
change the direction of a direct current
change the voltage of an alternating current
change the direction of an alternating current
In an electric generator, such as at a power plant, what produces electric current?
the movement of magnets around wire coils
the movement of wire coils in a magnetic field
a magnetic field being quickly turned on and off
rapid coiling and uncoiling of wire around a magnet
What does electric current pass through before entering your house from power transmission lines?
a turbine
a generator
a step-up transformer
a step-down transformer
At which of the marked points in this image is the magnetic force strongest?
at point A
at point B
at point C
at point D
Which is true of a temporary magnet?
its atoms do not form magnetic domains
its magnetic domains are always aligned in the same direction
its magnetic domains become aligned only when it is placed near a magnet
its material becomes ferromagnetic only when it is placed near a magnet
Which of the following statements is NOT true?
Earth's magnetic field is caused by molten metals in Earth's core
A compass alone will not direct you to the geographic north pole.
Earth's magnetic field causes auroras that are sometimes seen at the poles.
The magnetic poles of the Earth are at the same locations as the geographic poles.
The arrangement of atoms in a magnet is represented in which diagram(s)?
diagram A
diagram B
diagram C
none of these
Which creates a magnetic field?
moving charged particles
stationary charged particles
moving neutral particles
stationary neutral particles
Which action makes an electromagnet stronger?
decreasing the current through the wire
adding more coils of wire
removing the ferromagnetic core
making the coils of wire looser
Which diagram best represents the magnetic field around a wire through which current is flowing?
diagram A
diagram B
diagram C
diagram D
When does a magnet produce an electric current in a wire that is near it?
only when the magnet moves
only when the wire moves
when either the magnet or the wire move
when neither the magnet nor the wire move
Which is the correct sequence of steps in an electric power plant?
energy source, generator, turbine
turbine, energy source, generator
generator, energy source, turbine
energy source, turbine, generator
What is indicated by the red arrow in this image?
a generator that turns an energy source into electric energy
a step-up transformer that increases voltage for transmission through the power lines
a step-down transformer that decreases the voltage going into a neighborhood
a step-down transformer that decreases the voltage to 120 V for use in homes
The interaction between two magnets is called __________.
current
polarity
magnetic force
magnetic field
Which of the following is found in all magnets?
a transformer
a geographic pole
an electrical field
a N pole and a S pole
Which are regions where the magnetic force exerted by a magnet is strongest?
auroras
magnetic poles
magnetic domains
magnetic field lines
Groups of atoms with aligned magnetic poles are called __________.
elements
magnetic fields
magnetic domains
permanent magnets
Which is a magnetic needle that is free to move and that aligns itself along magnetic field lines?
a pole
a domain
a compass
an electromagnet
Magnetic field lines that curve away from each other show __________.
repulsion
attraction
a magnetic domain
where the magnetic field is strongest
An electric current is a flow of __________ from one place to another.
atoms
protons
electrons
neutrons
What effect does increasing the current flowing in the wire have on an electromagnet?
It has no effect on the electromagnet.
It increases the strength of the magnetic field.
It decreases the strength of the magnetic field.
It causes it to become a permanent magnet.
Electric current passing through a wire produces __________.
a compass
geographic poles
a permanent magnet
a magnetic field around the wire
Which of the following changes electrical energy into kinetic energy?
generator
transformer
electric motor
superconductor
Which of the following devices produces electric current?
generator
compass
motor
electric fan
Which of the following devices can increase or decrease the voltage of an alternating current?
motor
battery
generator
transformer
Which flows in only one direction through a wire?
voltage
direct current (DC)
alternating current (AC)
electric current
Alternating current changes the __________ of the current flow.
strength
voltage
amount
direction
