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Assess Yourself (score yourself out of 12)
Multiple Choice (6 points)
1. A parallel plate capacitor is connected to a battery of potential V. The distance between the plates is doubled without disconnecting the battery. Which of the following is true?
a. Both the capacitance and the charge on the plates are decreased by one-half.
b. The capacitance is decreased by one half, but the charge on the plate is unchanged.
c. The capacitance is unchanged, but the charge on the plates is decreased by one-half.
d. The capacitance is doubled, and the charge on the plates is unchanged.
e. Both the capacitance and the charge on the plates are doubled.
2. Two large, flat, parallel, conducting plates are 0.04 m apart. The lower plate is at a potential of 2 V with respect to ground. The upper plate is at a potential of 10 V with respect to the ground. Point P is located 0.01m above the lower plate. What is the electric potential at point P?
a. 10 V
b. 8 V
c. 6 V
d. 4 V
e. 2 V
3. A point P is 0.50 meter from a point charge of 5.0 X 10^‑8 coulomb.
a. 2.5*10^-8 V
b. 2.5*10^1 V
c. 9.0*10^2 V
d. 1.8*10^3 V
e. 7.5*10^3 V
1. A parallel plate capacitor is connected to a battery of potential V. The distance between the plates is doubled without disconnecting the battery. Which of the following is true?
a. Both the capacitance and the charge on the plates are decreased by one-half.
b. The capacitance is decreased by one half, but the charge on the plate is unchanged.
c. The capacitance is unchanged, but the charge on the plates is decreased by one-half.
d. The capacitance is doubled, and the charge on the plates is unchanged.
e. Both the capacitance and the charge on the plates are doubled.
2. Two large, flat, parallel, conducting plates are 0.04 m apart. The lower plate is at a potential of 2 V with respect to ground. The upper plate is at a potential of 10 V with respect to the ground. Point P is located 0.01m above the lower plate. What is the electric potential at point P?
a. 10 V
b. 8 V
c. 6 V
d. 4 V
e. 2 V
3. A point P is 0.50 meter from a point charge of 5.0 X 10^‑8 coulomb.
a. 2.5*10^-8 V
b. 2.5*10^1 V
c. 9.0*10^2 V
d. 1.8*10^3 V
e. 7.5*10^3 V
4. Two positive charges of magnitude q are each a distance d from the origin A of a coordinate system as shown above. At which of the following points is the electric potential greatest in magnitude
a. A
b. B
c. C
d. D
e. E
a. A
b. B
c. C
d. D
e. E
5. The capacitance of a parallel-plate capacitor can be increased by increasing which of the following?
a. The distance between the plates
b. The charge on each plate
c. The area of the plates
d. The potential difference across the plates
e. None of the above
6. An electron volt is a measure of
a. energy
b. electric field
c. electric potential
d. force
e. electric charge
a. The distance between the plates
b. The charge on each plate
c. The area of the plates
d. The potential difference across the plates
e. None of the above
6. An electron volt is a measure of
a. energy
b. electric field
c. electric potential
d. force
e. electric charge
Two charges are situated as shown. The distances are given in the drawing. The charges have the following values: q1 is 5.0 mC and q2 is -2.0 mC.
(a) Find the potential difference at point P.
(b) How much work is required to bring a third point charge of 4.0 mC from infinity to P?
(a) Find the potential difference at point P.
(b) How much work is required to bring a third point charge of 4.0 mC from infinity to P?