Chapter 23 Gauss' Law
In this chapter we will introduce the following new concepts:
The flux (symbol ) of the electric field Symmetry Gauss' law We will then apply Gauss' law and determine the electric field generated by: An infinite, uniformly char
Gravitational field (analogous to
electric field)
How can we determine if a gravitational field
is present somewhere?
Place a mass there and observe whether it
experiences a gravitational force (weight)
How can we determine if an electric field is
pres
The path length difference is /2 (represented by the dotted half-wave).
This means that thick troughs line up with thin peaks at the selected point on the screen.
This means that there's destructive interference at the selected point on the screen.
The p
Ray Model
Light travels through transparent media in
straight lines (light rays) at speed v = c/n,
where n is the index of refraction of the
medium
Light rays do not interact with one another
Light rays continue forever unless they interact
with matter
Plane of current loop (vertical)
I
Area of loop = A = ab
a
Magnetic field B is horizontal, going into this plane at some angle
b
Vertical plane containing magnetic
field vectors
F toward center of loop (no torque)
B
Fred = BIb
toward
you
Fblue = BIb
away
Rated Power of Light Bulbs
12 V
12 V
A
The rated power of bulb A (valid when
the voltage across it is 12 V) is 50 W:
P12V,A = 50 W
RA = (12 V)2/50 W
B
The rated power of bulb B (valid when
the voltage across it is 12 V) is 100 W:
P12V,B = 100 W
RB = (12 V
Magnets
Every magnet has a north pole
and a south pole
Like poles repel
Opposite poles attract
The magnetic field B at any point
is a vector whose direction is that
of compass needle placed there
The magnetic field is tangent to
the magnetic field line at
Chapter 24 Electric Potential
In this chapter we will define the electric potential ( symbol V ) associated with the electric force and accomplish the following tasks:
Calculate V if we know the corresponding electric field. Calculate the electric fi
Chapter 25 Capacitance
In this chapter we will cover the following topics: -Capacitance C of a system of two isolated conductors. -Calculation of the capacitance for some simple geometries. -Methods of connecting capacitors (in series, in parallel).
Chapter 21 Electric Charge
In this chapter we will introduce a new property of matter known as "electric charge" (symbol q). We will explore the charge of atomic constituents. Moreover, we will describe the following properties of charge: - Types of
Chapter 22 Electric Fields
In this chapter we will introduce the concept of an electric field. As long as charges are stationary, Coulomb's law describes adequately the forces among charges. If the charges are not stationary we must use an alternati
Electric charge
The charge of a proton is 1.6 10-19 C = e
The charge of an electron is (-1.6 10-19 C) = -e
The charge of an object is the sum of the charges
of all the protons and electrons in the object
An "uncharged" object has equal numbers of
prot