Physics 1C First Week Class notes : Walter Gekelman
Physics 1C Fall 2012
Class Notes : Walter Gekelman
Let us review once again the Force laws as well as those involving electric forces:
(1) F = q E + v B
Force law with Lorentz term
Problem 1. Given a disc of inner radius a and outer radius b with surface charge
density spinning in the clockwise direction. The disk spins about the z axis with
angular frequency . An observer is located at position z (on the z axis).
a) What is the mag
The geometry of spacetime is non-Euclidian. Euclidian geometry is
what you learned in high school. Spacetime geometry is hyperbolic! For
space time the Lorentz transformation is such a matrix. The
Fall quarter 2012
Albert Einstein got to thinking about light and relative motion. He came
up with two postulates, which seem innocent enough but shook the
1) The laws of physics have the
Consider a small hole with a light source on one side. The light spreads
out as a spherical wave from this point source as in the gure below:
When the light hits a point on a screen ther
Interference of Light:
If two vectors of equal magnitude and opposite direction are added their
sum is zero. This is the basic principle of the interference of light.
E = E0 cos( kz t ) E0 cos( k
Consider the energy density of an electromagnetic wave. To get it let us add the energy
density (energy/volume) of electric fields and of magnetic fields.
0E 2 +
B but = c =
Spring Quarter 2011
W. Gekelman Notes-5
Let us write down Maxwells equations in both integral and differential form.
B = 0
B = 0 j + 0 0
E i ndA =
BindA = 0
E i dl = Bi ndA
Fall Quarter 2012
Now let us examine a series LRC circuit with a battery and a switch. is
closed at t=0. First lets do it the books way. We will next introduce a far
better method using complex numbers.
Let us take
Week 3 notes
Fall Quarter 2012
leads us to the concept of inductance. If one part
of a circuit produces a changing magnetic ux and this in turn goes
through a loop in another part of a circuit or in an adjacent circuit it will
Physics 1C notes
= Bi ndA
Prof. Walter Gekelman
B is the magnetic ux. The rst term is the total time derivative of the
magnetic ux and the second is the same (the integral is simply the
IC Midterm 2!
W. Gekelman !
1) An electromagnetic wave traveling in a medium with index of refraction n1 strikes a
second media with index of refraction n2 at an angle of 1, where the angle of incidence
is greater than the critical angle