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Master Separate Science - Physics > Separate Physics - 6.7 > Flashcards

Separate Physics - 6.7 Flashcards

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1
Q

Where, in a magnet, is the magnetic force the strongest?

A

The poles

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2
Q

What happens when two magnets are brought closer together?

A

They exert a force on one another

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3
Q

What do two like poles do?

A

They repel each other

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4
Q

What do two unlike poles do?

A

They attract each other

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5
Q

What is attraction and repulsion between two magnetic poles an example of?

A

Non-contact force

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6
Q

What does a permanent magnet produce?

A

Its own magnetic field

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7
Q

What is an induced magnet?

A

A material which becomes a magnet when it is placed in a magnetic field

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8
Q

What does induced magnetism cause?

A

A force of attraction

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9
Q

What happens when an induced magnet is removed from the magnetic field?

A

Loses most / all of its magnetism quickly

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10
Q

What is the magnetic field?

A

The region around a magnet where a force acts on another magnet or on a magnetic material

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11
Q

Give some examples of a magnetic material

A
  • Iron
  • Steel
  • Cobalt
  • Nickel
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12
Q

What force exists between a magnet and a magnetic material?

A

Attraction

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13
Q

What does the strength of a magnetic field depend on?

A

The distance from the magnet (with the field being strongest at the poles)

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14
Q

How can the direction of the magnetic field be identified?

A

It is given by the direction of the force which would act on another north pole placed at that point

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15
Q

What is the direction of a magnetic field line?

A

From the north (seeking) pole to the south (seeking) pole of the magnet

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16
Q

What does a magnetic compass comprise of?

A

A small bar magnet (pointing towards the Earth’s magnetic field)

17
Q

What happens when a current flows through a conducting wire?

A

A magnetic field is produced

18
Q

What affects the strength of a magnetic field through a conducting wire with current flowing through?

A

The current through the wire and the distance from the wire

19
Q

How can the strength of a magnetic field created by a current through a wire be increased?

A

The wire can be shaped, forming a solenoid (the magnetic field inside a solenoid is strong and uniform)

20
Q

What is the shape of the magnetic field around a solenoid?

A

A similar shape to that of a bar magnet

21
Q

What does an iron core in a solenoid do?

A

Increases the strength of the magnetic field

22
Q

What is an electromagnet?

A

A solenoid with an iron core (it can be turned on and off)

23
Q

Higher Q. What is the motor effect?

A

A conductor carrying a current placed in a magnetic field causes the magnet and the conductor to exert a force on one another

24
Q

Higher Q. What does Fleming’s left-hand rule represent?

A

The relative orientation of the force, current in the conductor and magnetic field

25
Q

Higher Q. What does a coil of wire, carrying a current in a magnetic field, tend to do?

A

Rotate (the basis of an electric motor)

26
Q

Higher Q. What does the force on a conductor in a magnetic field cause?

A

The rotation of the coil in an electric motor

27
Q

Separate Higher Q. How do loudspeakers and headphones use the motor effect?

A

Converting variations in current in electrical circuits to the pressure variations in sound waves

28
Q

Separate Higher Q. What is the generator effect?

A

A potential difference induced across the ends of a conductor, inducing a current

29
Q

Separate Higher Q. What can cause a potential difference to be induced across the ends of a conductor?

A

If an electrical conductor moves relative to a magnetic field or there is a change in the magnetic field around a conductor

30
Q

Separate Higher Q. An induced current generates a magnetic field: what does this oppose?

A

The original change: either the movement of the conductor or the change in magnetic field

31
Q

Separate Higher Q. In an alternator, what does the generator effect cause?

A

AC

32
Q

Separate Higher Q. In a dynamo, what does the generator effect cause?

A

DC

33
Q

Separate Higher Q. How do microphones use the generator effect?

A

They convert the pressure variations in sound waves into variations in current in electrical circuits

34
Q

Separate Higher Q. What does a basic transformer consist of?

A

A primary and secondary coil, wound on an iron core

35
Q

Separate Higher Q. If a transformer was 100% efficient, what would the electrical power output equal?

A

The electrical power output would equal the electrical power input

36
Q

Separate Higher Q. How do transformers use AC?

A

The effect of an AC in one coil induces a current in another

37
Q

Separate Higher Q. How does the ratio of the potential differences across the two coils vary?

A

The potential differences depend on the ratio of the number of turns on each

Master Separate Science - Physics (8 decks)

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