Coulomb's Law
Electric Field.
Potential
Flux/Gauss
Miscellaneous
100
Like charges repel, opposites ___
What is attract?
100
Unit of electric field
N/C
100
We only measure __________in potential.
differences
100
What direction do we want to field to be compared to the area?
Perpendicular or Parallel
100
How old was I when I learned to walk? (give your answer in months)
8 months
200
This graph represents Coulomb's Law.
What is graph A?
200
Give two rules about field lines
Symmetrical, don't cross, toward neg/away pos, spacing indicates strength, arrows indicate direction
200
Unlike electric field, potential is a
scalar
200
What would be a good Gaussian shape for a line of charge?
Cylinder
200
Who is Shrek's best friend?
Donkey
300
The distance between two charges is doubled, this is how the force between them change.
What is 1/4?
300
Two +3 nC charges are spaced 4 cm apart. What is the electric field 1 cm from the left charge (between the charges).
240 KN/C
300
An electron moves toward a positive charge. It's potential energy _________ while its kinetic energy _________.
Decreases, Increases
300
What is the electric flux through a 1 cm radius circle if the field is 1000 N/C passing through it maximally.
0.1 pi Nm2/C
300
Who is competing in the Superbowl?
Seahawks and Patriots
400
Two charges opposite in charge but equal in magnitude are 4m away from each other. One of the charges is replaced with one that is 1/3 as strong located at 2 m instead. What happens to the force?
It is 4/3 as strong
400
Write dq in terms of area density and dr for a disk of charge.
dq = sigma*2*pi*r*dr
400
Two charges (-3 nC, 4 nC) are arranged as shown (4 cm apart). What is the potential at the point shown?
-180 V
400
Consult the picture. What is the electric field at the origin?
0
400
Who was the last presidential candidate to win all but one state in the electoral college?
Ronald Reagan
500
A charge of +4 μC is placed at the origin, and two charges, +2 μC and -3 μC, are placed at (3,0) m and (-4,0) m, respectively. This is the net force and direction acting on the +4 μC charge due to the other two charges.
What is 0.01475 N to the left.
500
A 120 degree arc of uniformly distributed charge creates an electric field at the center of the arc, R away. Write the integral you would need.
k*lambda/r * integral (cosxdx)
500
What speed does a proton need to be given to escape a -1 microC charged sphere starting 1 cm away?
1.34E7 m/s
500
A long cylinder of with charge density rho = b*r has an inner radius r1 and outer radius r2. What is the equation for electric field from r1 to r2?
b(r^3 - r1^3)/(3epsilion*r)
500
Why would I walk 500 miles, and then walk 500 more?
To be the man who walked 1000 miles to fall down at your door.