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Chapter 23

PHYS 142 Chapter Notes - Chapter 23: Test Particle, Electric Field, International System Of Units


Department
Physics
Course Code
PHYS 142
Professor
Yoichi Miyahara
Chapter
23

Page:
of 15
PHYS 142 Chapter 23 SmartNotes
23.1 Properties of Electric Charges
o Electric Charges
Positive (Protons)
Negative (Electrons)
o Properties
Charges of the same sign repel one another and charges with
opposite signs attract one another.
Electric Charge is Conserved in an Isolated System. The
electrified state is due to a transfer of charge from one object to
the other.
Electrons are transferred in the rubbing process from the glass to
the silk.
The electric charge
q
is said to be quantized, where q is the
standard symbol used for charge as a variable. That is, electric
charge exists as discrete “packets” and we can write  ,
where N is some integer.
23.2 Charging Objects by induction
o Insulators
Examples
Glass
Rubber
Dry Wood
How to Charge an Insulator
o Conductors
Examples
Copper
Aluminum
Silver
How to Charge a Conductor
Induction
o
o Charging an object by induction requires no contact
with the object inducing the charge.
Conduction
o Charging by rubbing
o
o SemiConductors