PHY 2049: Physics II Tutoring Center is open in room NPB 1100, M-F 10:00AM -3:00PM. It is free. Hopefully all webassign problems have been solved. Please see me immediately after the class if there is still an issue.
PHY 2049: Physics II
Tutoring Center is open in room NPB 1100, M-F 10:00AM -3:00PM. It is free.
Hopefully all webassign problems have beensolved. Please see me immediately after the class if there is still an issue.
PHY 2049: Physics II
About bicycle riding: If some one shows you a trick, it means that,
It is possible to do that trick The person who showed you, can do the
trick. It does not mean that you can do the trick.
Try it a lot of times and you can too.
Electric fields from different geometrical objects. wires Rings and disks Planes
Another algorithm Al-Khwarizmi the Persian astronomer and mathematician, wrote a treatise in Arabic in 825 AD, On Calculation with Hindu Numerals, which was translated into Latin in the 12th century as Algoritmi de numero Indorum[1], which title was likely intended to mean "Algoritmi on the numbers of the Indians", where "Algoritmi" was the translator's rendition of the author's name; but people misunderstanding the title treated Algoritmi as a Latin plural and this led to the word "algorithm" (Latin algorithmus) coming to mean "calculation method". The intrusive "h" is most likely due to a false cognate with Greek αριθμος arithmos = "number".
(wikipedia: http://en.wikipedia.org/wiki/Algorithm#Etymology
PHY 2049: Physics II
Gaussian (imaginary) surfaces
Flux = Φ = ∑ E.dA E.dA for a cube is
easy to visualize. Let calculus do it for
a sphere or any other shape.
Φc = qtotal /εo
•For a cylinder with axial field, no contribution to flux from the side walls.
•From the far top, >0
•Near (bottom) , <0
PHY 2049: Physics II
No force/field from the charge outside
On inside circle E.4πr2=q/εo
Coulomb’s law Very outside, E = k
5q/r2
P
++
+
+ +
+
PHY 2049: Physics II
The electric field in a metal is zero
Charge +q on inside surface.
Because it is neutral, outside surface must be -q.
PHY 2049: Physics II
Electric field is radial. E.A = 0 for the top
and bottom surfaces. Sideways:
E 2πrh = λh/ε0
E = λ/ 2πrε0