1. Consider two uniformly charged parallel plates as shown above. The magnitudes
ID: 1398882 • Letter: 1
Question
1.
Consider two uniformly charged parallel plates as shown above. The magnitudes of the charges are equal.
(For each statement select T True, F False).
A) If the plates are oppositely charged, there is no electric field at c.
B) If both plates are positively charged, there is no electric field at b.
C) If both plates are negatively charged, the electric field at a points towards the top of the page
2. If the plates are 1.0 cm by 1.0 cm squares, and the charges on the plates are +/-2.60 microC, respectively, what is the magnitude of the electric field at b?
Explanation / Answer
A) True
B) True
C) This statement is not given clearly.
If both plates are negatively charged,
at point b electric field is zero.
at point a electric field is downward
at point c electric field is upward
2) surface charge density, sigma = Q/A
= 2.6*10^-6/(0.01^2)
= 2.6*10^-2 c/m^2
Eelectric filed at point b, E = sigma/(2*epsilon) + sigma/(2*epsilon)
= sigma/epsilon
= 2.6*10^-2/(8.854*10^-12)
= 2.94*10^9 N/c
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