# Electric Force & Field Flashcards Preview

## Electricity & Magnetism > Electric Force & Field > Flashcards

Flashcards in Electric Force & Field Deck (31)
1
Q

How many types of charges are there? What are they?

A

Two; positive and negative

2
Q

Fundamental charge

A

e of the electron

3
Q

What does it mean by the fact that “Charge is quantized?”

A

The charge, q, on every object must be an integral multiple of the fundamental charge, e, of the electron.

4
Q

Charge of 1C

A

1C = Charge of 6.242 * 10^18 e

5
Q

What does the “Charge is conserved” mean?

A

The net charge of any isolated system is always conserved.

6
Q

Three ways to transfer charge

A

Friction, Conduction, and Induction

7
Q

Atoms consist of

A

A nucleus surrounded by an electron cloud.

8
Q

What type of substance pulls electrons from another substance?

A

The more electronegative substance pulls electrons from the less electronegative substance.

9
Q

Insulator

A

Charges immobile

10
Q

Conductor

A

Charges mobile

11
Q

Ground

A

Virtually limitless source or sink of charge.

12
Q

Most natural material are…

A

lousy conductors, but also not very good insulators.

13
Q

Polarization of molecule

A

Electron cloud distorted so that one end is positive and one end of the molecule is negative (forming a dipole).

14
Q

Coulomb’s Constant

A

Ke = 1/4πepsilonnaught

15
Q

Polarization of molecule

A

Electron cloud distorted so that one end is positive and one end of the molecule is negative (forming a dipole).

16
Q

The principle of superposition of field

A

The resultant field at any point in space equals the vector sum of the fields created by the other present individual charges.

17
Q

A mass m sitting in a g-field experiences a force that is equal to

A

F=mg(r)

18
Q

g(r)

A

Measure of the strength of a gravitational field.

19
Q

Test charge function

A

A test charge is used to probe the strength of an electric field generated by a charge q.

20
Q

E(r)

A

Measure of the strength of an electric field.

21
Q

E is produced by what?

A

The source charge q.

22
Q

Electric Field Lines

A

Set of conventions that help visualize how E(r) permeates space (magnitude, direction)

23
Q

All field lines begin where and end where?

A

All field lines begin at a positive charge and end at a negative charge.

24
Q

E(r) is proportional to what?

A

The density of the field lines.

25
Q

All field lines begin where and end where?

A

All field lines begin at a positive charge and end at a negative charge.

26
Q

E(r) is proportional to what?

A

The density of the field lines.

27
Q

E at any point is tangent to what?

A

Field lines.

28
Q

Biased

A

Underestimate

29
Q

Measures of Dispersion

A

Range, Standard Deviation, and Variance

30
Q

Variance

A

Square of Standard Deviation.

31
Q

z-score

A

Measure of relative standing. Number of standard deviations that a value is above or below the mean.