Static Electricity, Charge, and Fields Quiz

Question 1

Static Electricity

Answer 1

Stationary electricity, study of charges at rest and the interactions between them

Question 2

how can you think of an electric field

Answer 2

one charge creates a field, a second actualizes the electric force.

Question 3

how do charged objects exert a force

Answer 3

by changing the space around them

Question 4

Electric Field

Answer 4

the force field, the changed property of space around a charged object

Question 5

units of the electric field

Answer 5

N/C (newtons/coulomb)

Question 6

is electric field vector or scalar?

Answer 6

vector

Question 7

The electric field on an object is

Answer 7

the amount of electric force exerted per unit of charge.

Question 8

what is the equation for electric field

Answer 8

Question 9

Electric & Gravitational Fields Compared

Answer 9

Question 10

how is E similar to g

Answer 10

Just like a mass in a gravitational field, the electric force that is exerted on a charge in an electric field depends on the magnitude of the electric field.

Question 11

what is another way to calculate the strength of an electric field

Answer 11

use the magnitude of the charge that creates the field

Question 12

Electric Field Map

Answer 12

A set of electric field lines representing the electric field around a charged object

Question 13

The direction of the electric field lines represents

Answer 13

the direction of the electric force on a positive test charge

Question 14

The density of the field lines represents

Answer 14

the strength of the electric field

Question 15

true or false: Electric Field lines never cross

Answer 15

true

Question 16

Electric Field to Charged parallel plates

Answer 16

Question 17

Electric Field Due to 2 positive Charges

Answer 17

Question 18

Electric Field Due to a Dipole

Answer 18

Question 19

The arrows show

Answer 19

the direction of motion/force for a positive charge

Question 20

A dipole

Answer 20

a pair of charged particles that have equal but opposite charges

Question 21

electric field around a point charge (positive or negative)

Answer 21

Question 22

An electric field is said to exist where?

Answer 22

anywhere an electric force is felt. Placing a positive test charge in a field and observing its path creates a segment of a “field map.”

Question 23

what is the unit of charge

Answer 23

coulomb

Question 24

true or false: protons and electrons have equal charges (same magnitude)

Answer 24

true

Question 25

1 coloumb is equal to?

Answer 25

C=6.24x 10^18 e

Question 26

an electron is equal to

Answer 26

1.6x10^-19 C

Question 27

coloumb's law

Answer 27

the force btw. 2 charges is equal to some constant times the first charge times teh second charge divided by distance between them squared

Question 28

what is the symbol for charge

Answer 28

q

Question 29

charged object

Answer 29

has unequal amounts of positive and negative charge

Question 30

Neutral object

Answer 30

has equal amounts of positive and negative charge

Question 31

is charge scalar or vector

Answer 31

scalar

Question 32

is charge conserved

Answer 32

Charge is conserved: when charge is transferred between objects equal amounts of charge are separated (the gain in + charge of one object= the gain in –charge of the other)

Question 33

properties of charge (list 6)

Answer 33

1. Two types of charge: positive and negative (charge is a scalar) 2. Charge is conserved: when charge is transferred between objects equal amounts of charge are separated (the gain in + charge of one object= the gain in –charge of the other) 3. Charges have an effect over a distance 4. Charge is quantized: the smallest possible charge an object can have is the charge of a proton or electron (+/- 1.6 x 10-19 C) 5. Objects with like charges repel, objects with opposite charges attract 6. Materials vary in their ability to hold charge(insulators/conductors)

Question 34

Conductors

Answer 34

don’t hold charge well (allow electrons to move freely)

Question 35

exs of conductors

Answer 35

Aluminum Gold Copper All Metal You!

Question 36

Insulators

Answer 36

hold charge well (don’t allow electrons to move freely)

Question 37

exs. of insulators

Answer 37

Plastics Ceramics Cloth

Question 38

How can we charge objects?

Answer 38

Objects can be charged in 3 different ways: friction, conduction, and induction

Question 39

Charging by Friction

Answer 39

When objects made from different insulating materials are rubbed together, electrons are transferred from one to the other Ex: - a balloon and wool - hair and a plastic comb - glass and silk

Question 40

Charging by conduction

Answer 40

2 conducting objects, with different net charges, come in contact with each other, causing electrons to move from one to the other Ex: - two copper wires - a human hand and a charged metal object

Question 41

Charging by Induction

Answer 41

A charged object is brought close to a conducting neutral object, causing the electrons in the neutral object to be rearranged The neutral object becomes polarized (no net charge, but electrons and protons are unevenly distributed in the object) If one side of the object is then grounded (connected to a source of infinite charge) it becomes charged overall

Question 42

Electric Force

Answer 42

A force of attraction or repulsion between charged objects A field force Depends on the amount of charge, the type of charge, and the distance separating the objects Smaller distance greater force More charge greater force