Magnetic Fields, Forces and Motors Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

What are properties of magnetic materials?

A
  1. They are dipolar
  2. They attract ferromagnetic material
  3. They can magnetize ferromagnetic materials as it aligns the dipoles of the domains
  4. They interact with other magnets
  5. They will align with earth’s field
  6. It produces a magnetic field around it
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is interesting about earth magnetic poles?

A

The south pole has a north magnetisation and the north pole has a south magnetisation.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is a solenoid?

A

It amplifies the magnetic field by causing the field lines of the straight wires to line up and gain magnitude

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What happens to charged objects in magnetic fields?

A

They will experience a force perpendicular to velocity and the magnetic field

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

How does a velocity selector work?

A

There is an overlay of a magnetic and electrical field, where only particles of qvB=Eq are able to pass through.
Too fast = up
Too slow = down

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

How does a mass spectrometer work?

A
  1. Particles enter the selector so that v=E/B
  2. The charged particles enters the mass spectrometers magnetic field, causing the particle to travel in circular curves
  3. Detectors measure the radiuses
  4. At this point, only mass affects the radius as the speed is the same. (F=QvB=mv^2/r) —— (r=mv/QB)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is the power supply in a motor?

A

DC power is supplied to the coils

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is the coil in a motor?

A

Copper wire that allows a current to run through it

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is the armature in a motor?

A

Is the whole rotating armature.
It usually consists of coils where the more coils increases the forces (The current through the magnetic field is put through more times).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is the purpose of a magnet in a motor?

A

The magnet is curved to bend the magnetic feilds

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is the stator in a motor?

A

The stationary part

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is the rotor in a motor?

A

The rotational part

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is the split-ring commutator in a motor?

A

It is used to reverse the direction of the current to continue the motion of the motor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What are the brushes in a motor?

A

They transfer the power to the split-ring commutator

How well did you know this?
1
Not at all
2
3
4
5
Perfectly