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Week 3 Clicker Solutions

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by

Richard Datwyler

on 5 October 2016

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Transcript of Week 3 Clicker Solutions

Week 3 Clicker Solutions
D
C
B
A
C
A
1 of the 5 charges has been removed, as show. What's the E field at the center?
a) +(kq/a ) j
b) -(kq/a ) j
c) 0
d) Something entirely different!
e) This is a nasty problem
Practice
A
C
A
how about L>>z
Gut feeling ?!?
Prove it!
D
D
Do you dare find this?
(not in this coordinate system)
D
Using the Divergence theorem, how can we express the LHS of Gauss's law?
D
C
B
A
By definition how can we find the Q enclosed inside the same volume?
D
C
B
A
Together:
or in differential form
C
C
C
2.2.3 Using Gauss's Law
Always true. But not always easy (useful)
E is constant on surface
E is perpendicular to surface
E is parallel to surface
Nice symmetries exist
All the above
Which of these conditions must be met to make it easy (useful)
A
B
C
D
E
E
Symmetries
Spherical Symmetry
Cylindrical Symmetry
Planar Symmetry
Choose Gaussian surface to match the symmetry
L
R
A Gaussian cylinder sits in a constant E field as shown, what is the total E Flux through the Gaussian surface?
D
C
B
A
D
Practice
A
A
B
B
Practice
A
D
D
C
C
C
B
B
A
C
Full transcript