Physics 07 - General Physics 2 » Fall 2020 » Quiz 2

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Question #1
Which of the following statements regarding electric potential is true?
A.   Equipotential surfaces are at right angles to lines of force.
B.   Electric potential is a vector quantity.
C.   Potential differences can be measured directly with a ballistic galvanometer.
D.   The units of electric potential are N/C.
E.   Equipotential surfaces for an isolated point charge are cubes concentric with the charge.
Question #2
Three charges are brought from infinity and placed at the corners of an equilateral triangle. Which of the following statements is true?
A.   The electrostatic potential energy does not depend on the order the charges are placed at the corners.
B.   The work required to assemble the charges is always positive.
C.   The electrostatic potential energy depends on which charge is placed at which corner.
D.   The electrostatic potential energy of the system is always positive.
E.   The work required to assemble the charges depends on which charge is placed at which corner.
Question #3
The electron volt is a unit of
A.   energy.
B.   potential.
C.   momentum.
D.   charge.
E.   capacitance.
Question #4
The equivalent capacitance of two capacitors in series is
A.   the sum of the reciprocals of their capacitances.
B.   always less than the smaller of the capacitances.
C.   the sum of their capacitances.
D.   always greater than the larger of their capacitances.
E.   described by none of the above.
Question #5
The concept of difference in electric potential is most closely associated with
A.   the charge on one electron.
B.   the work per unit quantity of electricity.
C.   the number of atoms in one gram-atom.
D.   the resistance of a certain specified column of mercury.
E.   the mechanical force on an electron.
Question #6
The voltage across each capacitor in a set of capacitors in series is
A.   inversely proportional to its capacitance.
B.   the same.
C.   None of these is correct.
D.   directly proportional to its capacitance.
E.   independent of its capacitance.
Question #7
Two parallel metal plates 5.0 cm apart have a potential difference between them of 75 V. The electric force on a positive charge of 3.2 × 10–19 C at a point midway between the plates is approximately
A.   4.8 × 10–18 N.
B.   2.4 × 10–17 N..
C.   4.8 × 10–16 N.
D.   1.6 × 10–18 N.
E.   9.6 × 10–17 N.
Question #8
A positive point charge of 10–4 C is located 3 m from another positive point charge of 10-5 C. Their mutual electric potential energy is
A.   zero.
B.   2 J.
C.   3 J.
D.   1 J.
E.   –1 J.

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