Magnetism Flashcards

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1
Q

What is a permanent magnet?

A

Material that creates its own magnetic field

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2
Q

What is a magnetic field?

A

Forces around an object where a magnetic material will experience a force

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3
Q

What happens when like and unlike poles are brought together?

A

Attraction

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4
Q

What happens to the strength of the magnetic field as you get further away

A

It decreases/gets weaker

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5
Q

Where is the magnetic field strongest?

A

Poles

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6
Q

In which direction to magnetic field lines point?

A

North to South

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7
Q

What does distance between magnetic field lines suggest?

A

The strength of the magnetic field

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8
Q

What is an induced magnet?

A

A material that becomes magnetic when placed in a magnetic field

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9
Q

What does a magnetic compass contain?

A

Small bar magnet

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10
Q

What is produced around a wire when an electrical current flows through it?

A

Magnetic field

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11
Q

What factors does the strength of the magnetic field around a straight wire depend on?

A

Size of current, distance from the wire

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12
Q

What effect does shaping the wire into a solenoid have on the magnetic field strength?

A

Increases strength of the magnetic field

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13
Q

How can the strength of the magnetic field inside a solenoid be increased?

A

Add iron core

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14
Q

What does Flemings left hand rule show?

A

The orientation of force, current of conductor and magnetic field (for motor effect)

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15
Q

Symbol for magnetic flux density, and the units it’s measured in

A

B

Measured in tesla (T)

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16
Q

What is the motor effect?

A

When a conductor placed in a magnetic field experiences a force

17
Q

What causes the motor effect?

A

Interaction between the magnetic field created by current in the wire, and the magnetic field in which the wire is placed

18
Q

What do loudspeakers and headphones do?

A

Use motor effect and the changing current to cause vibrations, converted into sound waves