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WorksheetsWayground S2 T4 L3 Electromagnetic Forces 26
Total questions: 35
Worksheet time: 19mins
Bob and Suzy are designing an electromagnet. Bob wants to add another battery to make the magnet stronger, and Suzy wants to add more coils to make the magnet stronger. Who is correct?
Bob
Suzy
Neither Bob nor Suzy
Both Bob and Suzy
Which field deals with the attraction and repulsion of positive and negative charges?
Gravitational
Magnetic
Alkaline
Electrical
The closer the charges, the ___________ the force between them.
equal
The electrical wires in many homes are made of copper and covered with plastic. Why are copper and plastic good choices for electrical wires?
Copper is a conductor of electricity, and plastic is an insulator of electricity.
Copper is an insulator of electricity, and plastic is a conductor of electricity.
Copper is a conductor of electricity, and plastic is an insulator of heat.
Copper is an insulator of electricity, and plastic is a conductor of heat.
Probably the most useful thing about electromagnets is that they can be turned ________ and ________.
on, off
positive, negative
north, south
on, negative
A wire carries a current, creating a magnetic field around itself as shown. The current in the wire is:
Directed to the right
Directed to the left
Equal to the magnetic field
In the same direction as the magnetic field
Who concluded that an electric current produces a magnetic field, showing that electricity and magnetism are related?
Hans Christian Orsted
Albert Einstein
Sir Isaac Newton
Thomas Edison
Nicola Tesla
True/False: Electricity and magnetism are NOT related.
True
False
How are electromagnets used in this picture? (select all that apply)
lifts the train off the track
keeps the train attracted to the track
propel it forward
stops the train from moving with friction
How do you determine the direction of a magnetic field based on the direction of current through a straight wire?
use the left-foot rule
use the right-hand rule
use the left-hand rule
use the right-foot rule
The microscopic regions in magnetic material that have all the atoms' magnetic fields lined up are called ___.
nodes
forces
domains
poles
One of the factors that determines the strength of the magnetic field in an electromagnet is the strength of the
neutrons.
wire.
current.
metal.
nail.
If a current is running through a straight wire, where is the magnetic field created by that current strongest?
Close to the wire
Far from the wire
Where the wire is connected to the battery
Everywhere has the same magnetic field
True/False: If the current is increased, the magnetic field becomes stronger. If the current decreases, the strength of the magnetic field decreases.
True
False
Which of the following is NOT a device that strengthens a magnetic field by running a current through a wire?
solenoids
electromagnets
magnetic compass
The area of magnetic force around a magnet is known as its _____________.
magnetic field
magnetic declination
magnetic fan lines
magnetic tan lines
___ are substances that become a magnet when exposed to a magnetic field.
Ferromagnetic materials
Electromagnetic materials
Solenoids
Conductors
True/False: The alloy steel, as well as the elements iron, nickel, and cobalt are ferromagnetic.
True
False
They repel.
They attract.
They cancel each other out.
The strength of the magnet is doubled.
Making an electromagnet stronger would not involve which of the following?
More current in the wire
Making the loops wider
Packing the loops tighter together
Having more loops
Ampere
Einstein
Tesla
Newton
Passing a current through a solenoid will produce ___.
An electric motor is connected to a battery. Which of the following will not make the motor output more kinetic energy?
Stronger magnetic field from the permanent magnets
More loops of wire in the spinning coil
Higher voltage for the battery
Lower resistance in the coil
Pulling the spinning coil away from the permanent magnets
Which one is evidence that electricity is flowing?
A component gets hot
The switch is closed
A component gets cold
The circuit is open
Why did the compass needle change position when the circuit was closed?
Electricity also runs through the compass.
A magnetic field surrounds a wire.
The compass-needle change indicates the potential energy.
The magnetic poles of the D-cell reversed.
Which of the following does not describe a circuit?
a pathway for the flow of magnetism.
a pathway for the flow of electricity.
the movement of electrons in one direction.
An electromagnet ... (select all that apply)
becomes a permanent magnet with electricity.
becomes a temporary magnet with electricity.
may be turned on and off.
has magnitude and direction.
A battery is... (select all that apply)
a source of chemical energy
a source of electrical energy
potential energy.
kinetic energy.
A current is applied to an object, such as a wire. What is true about the scenario?
A magnetic field is created.
The gravitational field is doubled.
Magnetic force is created in the direction of the object.
A moving charge opposite to the direction of the object is created.
Which of the following are true? Select 2.
A current creates a magnetic field.
A magnetic field creates a current in a wire.
A change in magnetic field creates a current in a wire.
Like sides of a magnet attract.
What effect will changing the number of loops in the coil from 4 loops to 2 loops have when using the coil to induce current with the bar magnet, as shown?
The voltage will double, the current will be cut in half.
The voltage will be cut in half, the current will be cut in half.
The voltage will double, the current will double.
There will be no effect.
Why does a compass needle change position when the circuit is closed? Select 2.
Electricity flows through the compass
A magnetic field surrounds the wire when electric current flows through it.
The circuit is complete.
The circuit is broken.
A doorbell sounds... (select all that apply)
due to the function of an electromagnet.
when the circuit is open.
when the circuit is closed.
when the electric current is "off".
Which component has potential energy to run the circuit?
switch
core
wire
battery
