When magnetic field lines are drawn, how do they look?

curved lines from N to S pole and outwards

lines extending outward in all directions like drawing the Sun

What's the difference between a solenoid and an electromagnet?

Electromagnets include a nail inside the coils.

Solenoids do not use a power source.

Solenoids include a nail inside the coils.

If two magnetic South poles are brought near each other, what would the magnetic field lines look like?

the lines would move out, but then curve away from each other

the lines would connect between the poles

the lines would curve like an "S"

since South poles repel, there would not be any lines

To reverse current direction in a motor the conducted current goes

through the brushes to the commutator

through the commutator to the armature

What do electric generators do

transform mechanical energy to electrical energy

transform mechanical energy to sound

transform electrical energy to mechanical energy

transform electrical energy to potential energy

Why might a current-carrying wire be placed between a magnetic field?

To produce a force from the interaction of magnetic fields

To increase the current from the interaction of magnetic fields

To increase the voltage from the interaction of magnetic fields

What direction is the force/motion in the following diagram?

Parallel and through the magnets

Name one factor that does not affect the size of a force in on a current-carrying conductor placed in a magnetic field?

Magnetic flux density/size of magnetic field

Give two ways you can reverse the direction of a basic dc motor?

Keep the magnetic field the same

How does a split ring commutator work?

Swaps the contact evert half turn, so that the left-hand and right-hand arms of the coil always experience a force in the same direction.

Swaps the contact evert full turn, so that the left-hand and right-hand arms of the coil always experience a force in the same direction.

Swaps the contact evert half turn, so that the left-hand and right-hand arms of the coil do not experience a force in the same direction.

How can the direction of an induced potential be reversed?

By changing the direction of the magnetic field

By changing the direction of the magnetic field, and moving the magnet in the opposite direction

In a dynamo, what is the function of the split ring commutator?

It reverses the coil connections every half turn, to keep the output current in the same direction all the time

It strengthens the magnetic field to make a greater output current for the same rotation speed

It reverses the connections every half turn, to keep the output current alternating every half turn

It prevents the coil from overheating

What is the function of a microphone?

It converts sound waves into electrical signals

It converts electrical signals into sound waves

It converts alternating current signals into direct current signals

It converts direct current signals into alternating current signals

How does a moving-coil microphone create electrical signals?

A coil of wire vibrates in a magnetic field

An electromagnet vibrates inside a coil of wire

A magnet vibrates inside a coil of wire

A small battery vibrates in a circuit

Which of the following defines "transformer action"?

The transfer of energy from one circuit to another through electromagnetic induction

The transfer of energy from one circuit to another through electrostatic action

The development of counter electromotive force where a magnetic field cuts a coil

The development of a voltage across a coil as it cuts through a magnetic field

The function of a transformer is to ...

increase or decrease A.C voltage or A.C current levels

raise and lower the apparent power levels

transfer DC voltage from the primary winding to the secondary winding

transform mechanical energy into electrical energy

Why might a current-carrying wire be placed between a magnetic field?

To produce a force from the interaction of magnetic fields

To increase the current from the interaction of magnetic fields

To increase the voltage from the interaction of magnetic fields

How is a potential difference in a wire induced using a magnetic field.

Moving the conducting wire through to the magnetic field lines.

Moving the conducting wire along the magnetic field lines.

Which two factors affect the size of a potential difference induced by the generator effect?

Speed of movement - which the wire is passed through the magnetic field lines

Strength of the magnetic field - the size of the magnet

In an electric motor, the energy transformation begins as ----

electrical and becomes mechanical

electrical and becomes chemical

mechanical and becomes electrical

mechanical and becomes chemical

The Fleming's right-hand rule is used when ....

current causes potential difference

Magnetism & Electromagnetism

Authored by John Rodgers

Physics

12th Grade

NGSS covered

Used 10+ times

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50 questions

Show all answers

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

_______ magnets have a North pole and a South pole.

Some

All

Broken

Tags

NGSS.MS-PS2-3

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The relationship between electricity and magnetism is called

electrical energy.

induced current.

electromagnetism.

ferromagnetism.

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

MULTIPLE CHOICE QUESTION

1 min • 1 pt

This is a picture of a simple electromagnet. How can the electromagnet be made stronger?

Add more coils of wire to the nail.

Use a smaller battery.

Reverse the poles of the magnet.

Remove all the coils and the nail.

Tags

NGSS.MS-PS2-3

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Surrounding every magnet is a(n) .

magnetic field

electrical current

smaller magnet

funny saying

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What kind of magnet can be turned on and off?

a refrigerator magnet

an electromagnet

magnetite

iron

Tags

NGSS.MS-PS2-3

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When two magnetic North poles are brought close to each other, they will

attract

repel

create sparks

cancel each other out

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When a magnetic South pole is brought close to a magnetic North pole, the magnets will

attract

repel

create sparks

cancel each other out

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

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Magnetism & Electromagnetism

_______ magnets have a North pole and a South pole.

The relationship between electricity and magnetism is called

This is a picture of a simple electromagnet. How can the electromagnet be made stronger?

Surrounding every magnet is a(n) __________ __________.

What kind of magnet can be turned on and off?

When two magnetic North poles are brought close to each other, they will

When a magnetic South pole is brought close to a magnetic North pole, the magnets will

When magnetic field lines are drawn, how do they look?

What's the difference between a solenoid and an electromagnet?

If two magnetic South poles are brought near each other, what would the magnetic field lines look like?

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Surrounding every magnet is a(n) .