WorksheetsPhysics Semester 1 Final Questions
Total questions: 68
Worksheet time: 49mins
Sophia made an electromagnet but it was very weak. How can she make it stronger?
take away the battery
wrap the wire loosely
use less copper wire
coiled more copper wire
What component becomes a temporary magnet when electricity is flowing through the circuit?
iron nail
copper wire
battery
switch
What component provides the pathway to carry electricity from component to component?
battery
wire
switch
iron nail
Which component provides the energy or the power source to run the electromagnet?
Iron nail
wire
Switch
Battery
Princess made an electromagnet with one battery and wrapped a copper wire 30 times while Megan made and electromagnet with one battery and wrapped a copper wire 50 times. Which electromagnet is stronger?
Megan
Princess
What is an electromagnet?
a permanent magnet with a north and south pole
a temporary magnet made from current carrying wire around a magnetic metal core
This is a picture of a simple electromagnet. How can the electromagnet be made stronger?
Remove all the coils and the nail.
Use a smaller battery.
Reverse the poles of the magnet.
Add more coils of wire to the nail.
Which of the following is NOT part of an electromagnet?
Toothpick
battery
Iron nail
wire
How are electromagnets different from magnets?
magnets have a North and South pole
you can turn an electromagnet on/off
magnets are more powerful
Surrounding every magnet is a __________ __________.
another magnet
electrical current
magnetic field
What would increase the strength of an electromagnet?
Changing the direction of the current
Increased the amount of electricity that flows through the wire.
Inserting a wooden core inside the coil
Decreasing the number of coils of wire
You can make an electromagnet stronger by: having a __________________core inside the wire.
smaller core
larger core
greener core
water core
What is a permanent magnet?
Can be turned off
Can not be turned off
Can turned on and off
Why do you think the compass needle is moving when is near to electromagnet?
Because of the magnetic field generated in the wire.
Because of the electricity generated in the compass.
What are the components of the electromagnet?
copper wire, iron nail, and a wooden stick
copper wire, iron nail
copper wire, iron nail, and a battery
Copper wire, paper and a battery
Click all the factors affecting electromagnetic induction
Strength of magnet
The area of the coil
The speed of movement
Number of turns of coil
The position of poles
How to increase the induced current?
Change carbon brush
Change position of the pole
Use small scale Galvanometer
Increase number of coils
into a coil with twice the number of loops,
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
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
A(n) ___ converts electricity into magnetism, and back to 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
As two oppositely charged particles approach each other, what happens to the electrical force between them?
The attractive force increases
The magnitude of the electric force decreases
The repulsive force increases
The magnitude of their charges increases
Which is the value of the constant in Coulomb's equation?
k = 9·10-9
k = 9.8
k = 6.67·10-11
k = 9 ·109
Recap:
Coulomb’s law states that the force between two charged objects will __________ when the magnitude of the object’s charge increases.
Coulomb’s law also states that the force between two charged objects will __________ when the distance between objects increases.
increase; increase
increase; decrease
decrease; increase
decrease; decrease
The image shows two charged particles with a force of 2.4 N. What would you predict the force of interaction would be when the magnitude of charge on q2 doubles?
9.6 N
4.8 N
1.2 N
.6 N
The image shows two charged particles with a force of 2.4 N. What would you predict the force of interaction would be when the distance doubles?
4.8 N
1.2 N
.6 N
.3 N
