How can we investigate the magnetic field pattern for a permanent bar magnet? You may select more than one option.

Place the magnet under a piece of paper and sprinkle iron filings over the top of the paper.

Place a compass near one of the poles of the magnet. Move the compass into various different places around the magnet & note the direction the compass is pointing. Join up the arrows to show the shape of the field.

How can we create a uniform magnetic field?

By placing two unlike poles near each other.

By placing two like poles near each other.

Why does a current carrying wire experience a force in a permanent magnetic field.

The current creates a magnetic field which interacts with the permanent magnetic field

The current creates energy which repels from the magnetic energy of the permanent magnets.

The current creates a voltage which is what a magnetic field is

The force on a current carrying wire going parallel to a magnetic field is:

There's no change between the wire being parallel and perpendicular

What does the thumb in Fleming's left hand rule represent?

The direction of the magnetic field

What does the first finger in Fleming's left hand rule represent?

The direction of the magnetic field

What does the second finger in Fleming's left hand rule represent?

The direction of the magnetic field

What is the role of a split ring commutator in an electric motor?

To reverse the direction every half turn to keep the motor spinning in the same direction

To increase the current to make the motor spin faster

To increase the magnetic flux density

Name three ways of making an electric motor rotate faster (select three):

Increasing the number of turns in the coil

Increasing the magnetic flux density of the magnets

Putting the magnets further apart

Increasing the resistance of the coil

What happens when a conductor is moved through magnetic field?

The resistance of the conductor increases

What happens to a generator if it is rotated twice as quickly?

Both the voltage and frequency double

The frequency of voltage doubles

A step up transformer.....

Decreases the current, and increases the voltage

Increases the current, and decreases the voltage

Step up transformers are used in the national grid to:

Decrease the energy losses due to heating of the transmission cables

Make it faster for electricity to reach homes

Which is the correct relationship between input and output voltages and the turns ratio for a transformer?

input voltage / output voltage = primary turns / secondary turns

input voltage x output voltage = primary turns x secondary turns

input voltage x output voltage = primary turns / secondary turns

Magnetism and electromagnetism

Authored by Chris Bradford

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the unit for power?

Amps (A)

Volts (V)

Watts (W)

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the unit for current?

Amps (A)

Volts (V)

Watts (W)

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the unit for voltage?

Amps (A)

Volts (V)

Watts (W)

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Two like poles

Attract

Repel

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Two unlike poles

Attract

Repel

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A magnetically soft material

Retains its magnetism for a long time

Loses its magnetism quickly

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Iron is

Magnetically soft

Magnetically hard

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Magnetism and electromagnetism

What is the unit for power?

What is the unit for current?

What is the unit for voltage?

Two like poles

Two unlike poles

A magnetically soft material

Iron is

What direction do magnetic field lines flow?

Which of the following are magnetic materials? You can select more than one option.

How can we investigate the magnetic field pattern for a permanent bar magnet? You may select more than one option.

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