What is an electric charge ?

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Electric charge experiment

Electric Charge

Electric charge is a basic property of matter.Two basic charges. Positive

and Negative

Each having an absolute value of

1.6 x 10-19 Coulombs

Where do charges come from?

Matter is made up of atoms.

++

+

–

––

+

–

Proton (positive charge)

neutron (neutral)

electron (negative charge)

atomnucleus

Where do charges come from?

If electrons = protons neutral

If electrons > protons gaining electrons,

negative charge

If electrons < protons losing electrons,

positive charge

Where do charges come from?

When a balloon rubs a piece of wool...

– electrons are pulled from the

wool to the balloon.

The balloon has more electrons than

usual.

+

+

+

+

+

–––

––

The balloon: – charged,

The wool: + charged

wool

Only the electrons can move.

Electric Forces

What is electric Forces ?

An electric forces is the forces between

particles that are caused by their electric charges.

What is an electric Forces ?

Electric Forces experiment

Experiments have shown that

Like signed charges repel each other

Unlike signed charges attract each other

Quantity of charge

q = Neq = Quantity of charge, Coulomb (C)

N = Number of electrons or proton

e = Charge of electron or proton

= 1.6 x 10-19 C

Quantity of charge

Find the net charge of a system consisting of 1.75 x 109 protons.

Problem

Find the net charge of a system consisting of 1.75 x 109 protons.

Problem

GIVEN:

FIND : q = ?

SOLUTION:

Quizs

What type of electric charge?

Positive charge

Object

1

What type of electric charge?

Negative charge

Object

2

What type of electric charge?

Neutral charge

Object

3

Which one of the following values is the smallest possible

amount of free charge that has been discovered?

a) 5.34 1020 coulombs

b) 1.60 1019 coulombs

c) 1.38 1023 coulombs

d) 6.63 1034 coulombs

e) 8.85 1012 coulombs

4

In order that the atom has a neutral

charge, what is the proper

configuration of the sub-atomic

particles of the atom?

1. Number of neutrons = Number of electrons

2. Number of neutrons = Number of protons

3. Number of protons = Number of electrons

4. Number of protons + Number of neutrons = Number

of electrons

5

Which subatomic particles of

an atom move most easily

from one material to another?

1. Electrons

2. Neutrons

3. Protons

4. None – No subatomic particles move

6

In the triboelectric series, wool has

a greater potential to give electrons

than copper. If wool and copper are

rubbed together, what charge will

occur by friction on the wool?

1. A negative charge

2. A neutral charge (i.e., electrons will balance out)

3. A positive charge

4. None of the above

7

Find the net charge of a system consisting of 1 x 103 electrons.

q = Ne = (1x103)(1.6x10-19)= 1.6x10-16 C

8

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