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Physics > 12. Magnetism and the Motor Effect > Flashcards

12. Magnetism and the Motor Effect Flashcards

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1
Q

At which part of a magnetic are the magnetic forces strongest?

A

The poles of the magnet.

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2
Q

What happens when two 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 two 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 two 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 magnetic is removed from a magnetic field?

A

The induced magnet loses most/all of its magnetism.

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9
Q

Give four 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 magnetic 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 (containing a needle magnet) 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.
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 the solenoid.

A

Strong and uniform.

21
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.

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

Fleming’s Left-Hand Rule

25
Q

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

A

The forefinger points in the direction of the magnetic field.

26
Q

When using Fleming’s 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 Fleming’s 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

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.

32
Q

What is the unit used for magnetic flux density?

A

Tesla, T

33
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.

Physics (13 decks)

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