Electric Charge and Electric Field

Question 1

When charges are at rest (not moving) in our frame of reference

Answer 1

Electrostatic

Question 2

Charge is produced on a glass rod by rubbing it with silk

Answer 2

Positive

Question 3

Charge is produced on rubber rod by rubbing it with fur

Answer 3

Negative

Question 4

Charges move freely through certain materials, particularly metals. These are called ____________.

Answer 4

Conductors

Question 5

Charges remain fixed in place on other materials. These are called __________.

Answer 5

Insulators

Question 6

The SI unit of charge is the ____________.

Answer 6

(C) Coulomb, e=1.602x10^-19

Question 7

The word “electric” is derived from the Greek word ________, meaning _________.

Answer 7

elektron, amber

Question 8

The _________ discovered as early as 600 B.C. that after they rubbed amber with wool, the amber could attract other objects. Today we say the amber has acquired a net ________ __________, or has become _________.

Answer 8

electric charge, charged

Question 9

Who suggested calling these two kinds of charge negative and positive?

Answer 9

Benjamin Franklin (1706-1790)

Question 10

The structure of atoms can be described in terms of what three particles?

Answer 10

negatively charged electron, positively charged proton, and uncharged nuetron

Question 11

The number of protons or electrons in a neutral atom of an element is called the ________ _________ of the element.

Answer 11

atomic number

Question 12

If one or more electrons are removed from an atom, what remains is called a positive ion. A negative ion is an atom that has gained one or more electrons. This gain or loss of electrons is called ___________.

Answer 12

ionization

Question 13

When we speak of the charge of a body, we always mean its _____ charge

Answer 13

net

Question 14

Principle of conservation of charge:

Answer 14

The algebraic sum of all charges in any closed system is constant

Question 15

Give another body a charge of opposite sign without losing any of its own charge.

Answer 15

Induction

Question 16

A slight shifting of a charge within the molecules of the neutral insulator

Answer 16

Polarization

Question 17

The magnitude of the electric force between two point charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them

Answer 17

Coulomb’s Law

Question 18

In SI units the constant k in coulombs law is:

Answer 18

8.99 X 10⁹N•m²/C²

Question 19

In SI units we usually write the constant *k *as

Answer 19

1/4πƐ₀

Question 20

Equation for Coulomb’s Law: force between two points

Answer 20

Question 21

What is the most fundamental unit of charge

Question 22

Which law describes only the interaction of two point charges

Answer 22

Coulomb’s Law

Question 23

Vector form of Coulomb’s Law

Answer 23