Basic Physics II 3B. Lecture 19.

UCI Physics 3B: Basic Physics II (Summer 2013)
Lec 19. Basic Physics II
Instructor: Roger McWilliams, Ph.D.

License: Creative Commons CC-BY-SA

Description: Second part of the Basic Physics 3 series. This course covers topics such as: fluid mechanics, thermodynamics,electrostatics (including dc circuits), magnetism (including eletromagnetic induction). The course assumes a working knowledge of calculus and trigonometry.

Recorded on September 9, 2013

[dancooper]

Watched all 19 lectures. Really enjoyed this class!📚

[subirkumarbandyopadhyay]

Physics is the subject that goes with REALITY.

[subirkumarbandyopadhyay]

eo = Permittivity of the medium & mo is the permiablity of the mediu

[subirkumarbandyopadhyay]

Guess the answer is very much important to guess the answer of any PHYSICS SUBJECT BASED PROBLEM.

[subirkumarbandyopadhyay]

1:13:41 Wave equation having function E the electric field E
d^2E/dx^2 = 1/c^ 2 d^E/dt ^2
As the LHS & RHS E both cases dependent on individual variable so they should be independent of variable x & t
So solution has to be assume
E(x, t) = X(x) T(t)
Then dE/dx = T dX/dx as here differentiation are depend only one variable operating .
So 1/X d^2X/dx^2 = 1/c^2T d^2T/dt^2 = k^ 2
So d^2X/dx^2 - k^ 2 X=0
So X = c1 e^ kx +c2 e^ -kx
Similarly T = c3 e^kt/c^2 + C4 e^-kt/c^ 2 t
So E (x, t) = [c1 e^kx +c2 e^ -kx] [ c3e^ kt/c^2 + c4 e^ -kt/c^2]
All constant like c1, c2 c3, c4 can be derived from BOUNDARY CONDITIONS. 1:13:41 1:13:41 1:13:41 0:12 0:43

[subirkumarbandyopadhyay]

Magnetic Induction B
Now $dB/dt ds = 1/eo dQe/dr + im0
Here the current obtined through change of electric flux @e should provide the DIELECTRC CURRENT .So the alternative way the last. equation we are writing

dB/dt = mo
I + 1/eo dD/dt which is one out of four Maxwell Electromagnetic Equation.