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GCSE Physics ⚛️ > Topic 12 🧲🧭 > Flashcards

Topic 12 🧲🧭 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 type of force is exerted if two like poles of a magnet are brought near eachother?

A

A repulsive, non-contact force

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3
Q

What type of force is exerted if two unlike poles of a magnet are brought near eachother?

A

An attractive, non-contact force.

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4
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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5
Q

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

A
  • Permanent magnet produces its own magnetic field.
  • Induced magnet becomes magnetic when placed in a magnetic field.
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6
Q

What type of force does induced magnetism always cause?

A

A force of attraction

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7
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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8
Q

Give four examples of magnetic materials.

A
  1. Iron
  2. Steel
  3. Cobalt
  4. Nickel
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9
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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10
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 pile of a magnetic.
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11
Q

What does a magnetic compass contain?

A

A small bar magnet that points in the direction of Earths magnetic field

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12
Q

What is produced when current flows through a conducting wire?

A

A magnetic field is produced around the wire

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13
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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14
Q

Does a high concentration of field lines ,Evan the field is strong or weak?

A

Strong

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15
Q

True or False: magnetic field lines never cross over eachother?

A

True

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16
Q

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

A
  • Place a compass on a piece 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.
17
Q

What is a solenoid?

A

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

18
Q

Describe the magnetic field found inside a solenoid.

A

Strong and uniform

19
Q

Is the field on the outside of a solenoid strong or weak? Why?

A

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

20
Q

What is an electromagnet?

A
  • A solenoid with an added iron core.
  • Adding the iron core increases the strength of the magnetic field
21
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.

22
Q

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

A

Fleming’s left hand rule

23
Q

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

A

Points in the direction of the magnetic field

24
Q

When using Fleming’s left hand rile what does the second finger represent?

A

Points in the direction of the current flow in the conductor

25
Q

When using Flemings left hand rule what does the thumb represent?

A

Points in the direction of the force produced by the motor effect.

26
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.
27
Q

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

A

The direction of the force is reversed

28
Q

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

A

The strength of the force is increased,

29
Q

Give the equation linking force, magnetic flux density, current and length.

A

F = BIL

30
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

31
Q

What is the unit for magnetic flux density?

A

Tesla, T

32
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

33
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 two sides perpendicular to the field experience forces in opposite directions.
  • This cause a rotational effect
34
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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