Tick TWO correct answers: The right-hand grip rule for the magnetic field of a wire states that:

The thumb represents the direction of the current

The fingers represent the direction of the magnetic field

The thumb represents the direction of the magnetic field

The fingers represent the direction of the current

Tick TWO correct answers: The right-hand grip rule for the magnetic field of a solenoid states that:

The thumb represents the direction of the magnetic field

The fingers represent the direction of the current

The thumb represents the direction of the current

The fingers represent the direction of the magnetic field

Which statement best describes an electromagnet?

A solenoid surrounding an iron core

A solenoid surrounding a metal core

A magnet surrounding an iron core

A magnet surrounding a metal core

How do permanent magnets behave?

Can attract and repel other magnetic materials

Can only attract other magnetic materials

Can only repel other magnetic materials

Have no effect on other magnetic materials

How do induced magnets behave?

Can only attract other magnetic materials

Can attract and repel other magnetic materials

Can only repel other magnetic materials

Have no effect on other magnetic materials

Which of the following will NOT increase the strength of an electromagnet?

Reversing the direction of the current in the circuit

Increasing the current flowing through the circuit

What effect does reversing the direction of the current have on the magnetic field of an induced magnet?

The direction of the magnetic field is reversed

The magnetic field becomes stronger

The magnetic field becomes larger

Which of the following would NOT increase the force of an electric motor?

Increasing the size of the magnet

Increasing the strength of the magnet

Which equation links current, force, length of wire and magnetic flux density?

force = magnetic flux density x current x length

magnetic flux density = force x current x length

current = magnetic flux density ÷ (length x force)

length = current ÷ (magnetic flux density x force)

An induced magnet has what properties?

Lose their magnetism when removed from a magnetic field

Are only magnetic when in a magnetic fields

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

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.

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

How is contact between the coil and circuit maintained in an alternator?

Slip rings and brushes allow continuous connection

A split ring commutator connects to each side for half a turn

The alternator can only complete one revolution and must then be rotated in reverse

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

Why transformers work with A.C. current but not D.C.

A.C current produces changing magnetic field.

D.C current produces changing magnetic field.

Aqa Electromagnetism

Authored by Charles Martinez

Science

11th Grade

NGSS covered

Used 2+ times

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Where are magnets strongest?

At the poles

At the top of the magnet

At the bottom of the magnet

In the middle of the magnet

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which type of force is a magnetic force?

Non-contact

Contact

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a magnetic field?

The area around a magnet where a force acts on magnets or other magnetic materials

The area around a magnet where a force acts on all materials

The area around an object with mass where a force acts

The area around charged materials where a force acts.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What effect would two north poles have on each other?

Attract

Repel

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What effect would two south poles have on each other?

Attract

Repel

Tags

NGSS.HS-PS3-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What effect would a north and a south pole have on each other?

Attract

Repel

Tags

NGSS.MS-PS2-3

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a permanent magnet?

A magnet that produces its own magnetic field

A material that becomes magnetic when placed inside a magnetic field

A material that becomes magnetic when it has a current running through it.

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Aqa Electromagnetism

Where are magnets strongest?

Which type of force is a magnetic force?

What is a magnetic field?

What effect would two north poles have on each other?

What effect would two south poles have on each other?

What effect would a north and a south pole have on each other?

What is a permanent magnet?

What is an induced magnet?

Which of the following are magnetic materials? (Choose all correct answers)

Which of the following are NOT magnetic materials?

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