Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Physics > Electrostatics > Flashcards

Electrostatics Flashcards

You may prefer our related Brainscape-certified flashcards:
Physics 101 flashcards AP® Physics flashcards
1
Q

Def the law of attraction and repulsion

A

The law of Attraction and Repulsion between charged particles states that
like charges repel and
unlike charges attract

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

Def the law of Conservation of charges

A

the law of Conservation of charges states that

Charge cannot be created or destroyed, but can be transferred from one object to another

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

How is a body charged by rubbing

A

The production of charges by rubbing is caused by a transfer of electrons from one material to the other

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

What happens when Polythene is rubbed with flannel

A

The polythene becomes Negative
Flannel becomes positive

Friction removes the electrons from the flannel
Electrons are added to the Polythene

Remember. The t in polythene has a - through.

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

What happens when Perspex is rubbed with Silk

A

Perspex becomes +
Silk becomes -

The friction cause the loss of electrons from the perspex, leaving the perspex positively charged while the silk gains the electrons, making the silk negative

Remember. The X in PerspeX is a + sign turned scew

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

Def a good conductor

A

a good conductor is a material through which electrons flow freely

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Def A good insulator

A

A good insulator is a material through which electrons cannot flow freely

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

Which materials will be charged best by rubbing them

A

Good insulators

Because the charge produced cannot move from where the rubbing occurs

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

Def. Electrostatic induction

A

Electrostatic induction is
the charging of neutral objects
by the close proximity of a charged object
which does not make contact with the neutral object

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

Describe how two neutral spheres can be given equal but oposite charges by induction

A

Let two spheres touch
Bring positively charged rod in close contact to one of the spheres
Move the spheres apart whilst rod is still in same place
Remove rod
Now 2 spheres are equalli, but opposite charged

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

Name some facts about electrostatic charge

A

The unit of charge is the Coulomb

1 coulomb of charge = quantity of charge on 6,25 x 10 ^18 electrons

A positively charged body has a deficiency of electrons

A negatively charged body has an excess of electrons

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

How does attraction between a charged and uncharged object take place?

A

Due to induction

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

Give an example of how attraction between a charged and uncharged object take place

A

A negatively charged polythene rod held close to a neutral piece of aluminium foil attracts it
The charged rod repels the mobile electrons of the aluminium foil to the far side of the foil leaving a positive charge on the surface closest the rod

Now the attraction forces between the negatively charged rod and positive side of the foil is greater than the repulsion forces (of the negative charged rod and negative side of the foil) due to the difference in distance

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

Describe how paper, which is an insulator without free electrons, can be attracted by a charged rod

A

Even though it does not have free electrons, a charge is induced by a distortion of the electron clouds of the atoms

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is the instrument called that you can use to show the presence of an electric charge

A

Electroscope

Remember. Electro - that is what we want to look at
Scope - what we use to look with

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Name 4 things that a electroscope can be used for

A
  1. To show the presence of an electric charge
  2. To test whether an electric charge is positive or negative
  3. As a Voltmeter requiring no current from the circuit
  4. To test the quality of electrical insulating materials
17
Q

Draw a electroscope with annotations

A

Metal cap

Insulating material

Metal rod

Metal case

Gold lead

Glass front

Earth

18
Q

How do you charge (by touch) an electroscope that is neutral

A

Touched by an object that is charged

Remember. Perspex rubbed with silk become positive
Polytene rubbed with flannel become -

19
Q

Describe how an electroscope can be charged by induction

A
  1. Bring a - charged rod in close contact to the cap of the electroscope. Gold leaf is deflected
  2. Earth the electroscope by touching the cap. Gold leaf collaps, because excess electrons flow away. Cap stays positively charged due to - charged rod
  3. Take negative charged rod away - electrons in goldfoil redistributes, leaving an overall + charge. Gold leaf deflects again
20
Q

How do we test for a charge using the electroscope

A

Charge a electroscope with a known charge. Bring the unknown charge in close proximity of the electroscope

Similar charges will cause the gold leaf to deflect even more.
Dissimilar charges will cause gold leaf to collapse.

21
Q

Def an electric field

A

an electric field is a region in space in which an electrical charge will experience a force

22
Q

What is a field line

A

It is a representation of an electrical field

23
Q

How will you determine the direction of a field line

A

It is the direction of force on a small positive test charge placed at that point

24
Q

Name 5 properties of field lines

A
  1. The direction is from + to -
  2. Field lines never cross
  3. Field lines occur in 3 dimensions, not only in the plane of the paper
  4. Field lines are closer in regions in which the field is strong and further apart where the field is weak
  5. An electric field is continuous (a limited number of field lines are drawn on paper to represent the field)
25
Q

Name 4 applications where we use electrostatics

A
  1. Van de graaf generator
  2. Photocopier
  3. Flue ash prescipitation
  4. Inkjet printers
26
Q

If 2 charged objects attract each other, the charges on the objects are…….

A

Unlike

27
Q

What happens to the goldleaf of a positively charged electroscope when a negatively charged rod comes in close proximity of the electroscope

A

The goldleafs will collaps / fall / return to their original position

28
Q

A positively charged rod is brought close to a charged electroscope. The goldleave is repelled further. It can be concluded that the electroscope was …..

A

Positively charged

29
Q

An electroscope is charged positively by direct touch of a rod

What charge did the rod have

A

+

30
Q

A electroscope is charged positively by induction

What charge did you have on the rod

A

-

31
Q

Draw the symbol for earth

A

A

32
Q

Make a neat sketch to illustrate the electric field around two positively charged spheres

A

A

33
Q

Give an example of a good conductor

A

Iron

Copper

34
Q

Give an example of a good insulator

A

Wood
Plastic
Rubber
Paper

35
Q

A separation of charge on an object through the close proximity of another charged object without contact is called ……….

A

Electrostatic Induction

Physics (17 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions