In the figure two large, thin metal plates are parallel and close to each other.

Question

In the figure two large, thin metal plates are parallel and close to each other. One their inner faces, the plates have excess surface charge densities of opposite signs and magnitude 4.20 times 10^22 C/m^2. What is the magnitude of the electric field at points between them? a) 2.37E-11 N/C b) 8.40E-11 N/C c) 4.75E-11 N/C d) 4.2 E-11 N/C d) 4.2 E-11 N/C e) 0 N/C A positive charge sits at the origin. Where is the electric potential (V) minimum? (a) At the origin (b) At infinity (c) Somewhere in between (d) Can't determine If the current through a resistor is doubled: A) only potential difference across the resistor is doubled B) only potential difference across the resistor is halved C) only the resistance is doubled D) only the resistance is halved E) both the potential and resistance are doubled In the diagram R_1 > R_2 > R_3. Rank the three resistors from least to greatest by the current through them. A) 1, 2, 3 B) 3, 1, 2 C) 1, 3, 2 D) 3, 2, 1 E) All are the same When resistors 1 and 2 are connected in series, the equivalent resistance is 20 Ohm. When they are connected in parallel, the equivalent resistance is 4.8 Ohm. The resistance of the two resisters are: a) 10 Ohm and 20 Ohm b) 12 Ohm and 8 Ohm c) 8 Ohm and 17 Ohm d) 16 Ohm and 4 Ohm e) 15 Ohm and 10 Ohm

Explanation / Answer

6.

Electric field at points between them is

E=(sigma/2eo)-(sigma/2eo)

E=0

7.

answer is b) at infinity

since electric potential due to point charge is

V=KQ/r

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