Chpt 16: Electric Charge and Fields

Question 1

what is charge?

Answer 1

the property by which a body can attract or repel another body without directly touching it

Question 2

What is the primary carrier of ‘charge’?

Answer 2

electrons

Question 3

what is the main idea of conservation of charge?

Answer 3

it cannot be created or destroyed; it has to come from somewhere and go somewhere.

Question 4

where does an object’s charge go when it isn’t connected to the ‘ground’?

Answer 4

usually it’s absorbed by polar water molecules in the air

Question 5

which type of object requires ‘contact’ in order to influence charge flow: conductors or inducers?

Answer 5

conductors

Question 6

which type of object DOES NOT require ‘contact’ in order to influence charge flow: conductors or inducers?

Answer 6

inducers

Question 7

where does charge flow to in the case of conductors?

Answer 7

from one object to another

Question 8

where does charge flow to in the case of inducers?

Answer 8

from one region of an object to another region of the same object.

Question 9

How are semi-conductors different from conductors?

Answer 9

in a semiconductor, electrons move within their respective atoms, but do not more freely throughout the object itself

Question 10

what is the ‘ground’?

Answer 10

a reservoir for collecting/pooling charge

Question 11

what is Coloumb’s law the expression for?

Answer 11

The amount of electric force (attraction or repulsion) experienced by one body due to another

Question 12

what is the eqn for Coloumb’s law?

Answer 12

F = k(Q1Q2/r^2)

Question 13

what is the charge on one electron?

Answer 13

• 1.6E-19C

Question 14

what is the sign for the charge on one electron?

Answer 14

-

Question 15

what is the sign for the charge on one proton?

Answer 15

+

Question 16

When you plug charges into the Coloumb’s law eqn, do you include their charges or included them as absolute values?

Answer 16

absolute values

Question 17

What is the K constant value in the coulombs law equation?

Answer 17

9.0E9 (Nm)/C^2

Question 18

what is the electronic force?

Answer 18

the interaction between electrically charged particles

The attractive or repulsive interaction between any two charged objects

Question 19

what is the electronic force also called?

Answer 19

electric force

electromagnetic force

Question 20

How does Dr. Beacom describe ‘static electricity’?

Answer 20

as the transfer of electrons between insulators

a stationary electric charge, typically produced by friction, which causes sparks or crackling or the attraction of dust or hair.

Question 21

How does Dr. Beacom distinguish between an electric conductor and an electric insulator?

Answer 21

in conductors charge moves freely bc the electrons are not tightly bound to their atoms.

In insulators, charge does NOT move freely bc the electrons ARE tightly bound to their atoms.

Question 22

is plastic an insulator or conductor?

Answer 22

insulator

Question 23

is metal an insulator or conductor?

Answer 23

conductor

Question 24

what is the mass of an electron?

Answer 24

9.10938356 × 10-28 grams

Question 25

What does Dr. Beacom say is the main thing we’re trying to understand with electric fields?

Answer 25

Trying to understand how forces act at a distance

Question 26

if electric charges create fields ( that exert interactive forces), what direction does the field point when the charge is positive?

Answer 26

away from the positive charge causing the field

Question 27

if electric charges create fields ( that exert interactive forces), what direction does the field point when the charge is negative?

Answer 27

towards the negative charge causing the field

Question 28

are field-causing charges usually drawn as positive charges or negative charges?

Answer 28

usually positive but they can be drawn as negative