Electric Force & Field

Question 1

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

Answer 1

Two; positive and negative

Question 2

Fundamental charge

Answer 2

e of the electron

Question 3

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

Answer 3

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

Question 4

Charge of 1C

Answer 4

1C = Charge of 6.242 * 10^18 e

Question 5

What does the “Charge is conserved” mean?

Answer 5

The net charge of any isolated system is always conserved.

Question 6

Three ways to transfer charge

Answer 6

Friction, Conduction, and Induction

Question 7

Atoms consist of

Answer 7

A nucleus surrounded by an electron cloud.

Question 8

What type of substance pulls electrons from another substance?

Answer 8

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

Question 9

Insulator

Answer 9

Charges immobile

Question 10

Conductor

Answer 10

Charges mobile

Question 11

Ground

Answer 11

Virtually limitless source or sink of charge.

Question 12

Most natural material are…

Answer 12

lousy conductors, but also not very good insulators.

Question 13

Polarization of molecule

Answer 13

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

Question 14

Coulomb’s Constant

Answer 14

Ke = 1/4πepsilonnaught

Question 15

Polarization of molecule

Answer 15

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

Question 16

The principle of superposition of field

Answer 16

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

Question 17

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

Answer 17

F=mg(r)

Question 18

g(r)

Answer 18

Measure of the strength of a gravitational field.

Question 19

Test charge function

Answer 19

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

Question 20

E(r)

Answer 20

Measure of the strength of an electric field.

Question 21

E is produced by what?

Answer 21

The source charge q.

Question 22

Electric Field Lines

Answer 22

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

Question 23

All field lines begin where and end where?

Answer 23

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

Question 24

E(r) is proportional to what?

Answer 24

The density of the field lines.

Question 25

All field lines begin where and end where?

Answer 25

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

Question 26

E(r) is proportional to what?

Answer 26

The density of the field lines.

Question 27

E at any point is tangent to what?

Answer 27

Field lines.

Question 28

Biased

Answer 28

Underestimate

Question 29

Measures of Dispersion

Answer 29

Range, Standard Deviation, and Variance

Question 30

Variance

Answer 30

Square of Standard Deviation.

Question 31

z-score

Answer 31

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