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GCSE Physics > Magnetism and the Motor Effect > Flashcards

Magnetism and the Motor Effect Flashcards

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1
Q

At which part of a magnet are the magnetic forces strongest

A

The poles of the magnet

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2
Q

What happens when 2 magnets are brought close to each other

A

They exert a force on each other

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3
Q

What type of force is exerted if 2 like poles of a magnet are brought near each other

A

A repulsive, non-contact force

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4
Q

What type of force is exerted if 2 unlike poles of a magnet are brought near each other

A

An attractive, non-contact force

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5
Q

What is a magnetic field

A

The region surrounding a magnet where another magnet or magnetic material experiences a non-contact force

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6
Q

What is the difference between a permanent magnet and an induced magnet

A
  • A permanent magnet produces its own magnetic field
  • An induced magnet becomes magnetic when placed in a magnetic field
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7
Q

What type of force does induced magnetism always cause

A

A force of attraction

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8
Q

What is the effect when an induced magnet is removed from a magnetic field

A

The induced magnet loses most/all of its magnetism

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9
Q

Give 4 examples of magnetic materials

A
  • Iron
  • Steel
  • Cobalt
  • Nickel
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10
Q

What can always be said about the force between a magnet and a magnetic material

A

It is always attractive

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11
Q

How does the strength of a magnetic field alter as you move further away from the magnet producing it

A

The magnetic field strength decreases the further you move away

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12
Q

In what direction does a magnetic field point

A
  • In the direction of the force that a north pole would experience if placed in the field
  • From the north seeking pole to the south seeking pole of a magnet
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13
Q

What does a magnetic compass contain

A

A small bar magnet that points in the direction of the Earth’s magnetic field

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14
Q

What is produced when current flows through a conducting wire

A

A magnetic field is produced around the wire

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15
Q

What determines the strength of the magnetic field around a current-carrying wire

A

The magnitude of the current flowing through the wire

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16
Q

Does a high concentration of field lines mean the field is strong or weak

A

Strong

17
Q

True or False: magnetic field lines never cross each other

A

True; they never cross, touch, or overlap

18
Q

How is a plotting compass used to map out a magnetic field

A
  • Place a compass on a pieve of paper near the field
  • Draw an arrow in the direction the compass points
  • Repeat at different points on the paper
  • Join the arrows to make a complete field pattern
19
Q

What is a solenoid

A

A coil of wire which when current passes through creates a strong magnetic field

20
Q

Describe the magnetic field found inside a solenoid

A

Strong and uniform

21
Q

Is the field on the outside of a solenoid strong or weak and why

A

Weak: The fields from each coil cancel out, making the outside field weak

22
Q

What is an electromagnet

A
  • A solenoid with an added iron core
  • Adding the iron core increases the strength of the magnetic field
23
Q

What is the motor effect

A

When a force is exerted between a magnetic field and a current-carrying conductor placed in that field

24
Q

What rule is used to determine the force produced by the motor effect

A

Flemings Left-Hand rule

25
Q

When using Fleming’s left hand rule what does the forefinger represent

A

The forefinger points in the direction of the magnetic field

26
Q

When using flemings left hand rule what does the second finger represent

A

The second finger points in the direction of current flow in the conductor

27
Q

When using flemings left hand rule what does the thumb represent

A

The thumb points in the direction of the force produced by the motor effect

28
Q

What factors affect the size of the force on a current-carrying wire in a magnetic field

A
  • The magnitude of the current flowing through the conductor
  • The strength of the magnetic field that the conductor is placed in
29
Q

If the direction of current in a current-carrying wire placed in a uniform magnetic field is reversed, what happens to the force

A

The direction of the force is reversed

30
Q

If the strength of the current in a current-carrying wire placed in a uniform magnetic field is increased, what happens to the force

A

The strength of the force is increased

31
Q

Give the equaton linking force, magnetic flux density, current, and length

A

Force (N) = magnetic flux density (T) x current (A) x length (m)

32
Q

What criteria must be met for the equation linking force, magnetic flux density, current and length to hold

A

The conductor must be at right-angles to the magnetic field it is placed in

33
Q

What is the unit used for magnetic flux density

A

Tesla, T

34
Q

If the current and the magnetic field are parallel to each other, which direction would the force act in

A

No force will act

35
Q

How does an electric motor work

A
  • A coil of wire, carrying a current, is placed in a magnetic field
  • The forces on the 2 sides perpendicular to the field experience forces in opposite directions
  • This causes a rotational effect
36
Q

How are electric motors kept rotating

A

A split ring commutator is used. This switches the current direction every half turn, which ensures that the coil keeps spinning

GCSE Physics (15 decks)

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