Abington Heights High School
AP Physics
Electrostatics Practice Quiz 2
Select the answer that best completes the question.
1. Consider three identical metal spheres, A, B, and C. Sphere A carries a charge of -2.0 µC; sphere B carries a charge of -6.0 µC; and sphere C carries a charge of +5.0 µC. Spheres A and B are touched together and then separated. Spheres B and C are then touched and separated. Does sphere C end up with an excess or a deficiency of electrons and how many electrons is it?
A.deficiency, 3.12 ´ 1013
B.excess, 3.12 ´ 1013
C.excess, 1.87 ´ 1013
D.deficiency, 6.24 ´ 1012
E.deficiency, 3.74 ´ 1012
2. Three charged particles A, B, and C are located near one another. Both the magnitude and direction of the force that particle A exerts on particle B is independent of
A.the sign of charge B.
B.the sign of charge A.
C.the distance between C and B.
D.the distance between A and B.
E.the magnitude of the charge on B.
3. Four point charges, each of the same magnitude, with varying signs are arranged at the corners of a square as shown. Which of the arrows labeled A, B, C, and D gives the correct direction of the net force that acts on the charge at the upper right corner?

A.A
B.B
C.C
D.D
E.The net force on that charge is zero.
4. Two positive point charges Q and 2Q are separated by a distance R. If the charge Q experiences a force of magnitude F when the separation is R, what is the magnitude of the force on the charge 2Q when the separation is 2R ?
A.F/4
B.F/2
C.F
D.2F
E.4F
5. A charge Q exerts a 12 N force on another charge q. If the distance between the charges is doubled, what is the magnitude of the force exerted on Q by q?
A.3 N
B.6 N
C.24 N
D.36 N
E.48 N
6. At what separation will two charges, each of magnitude 6 mC, exert a force of 1.4 N on each other?
A.5.1 ´ 10-6 m
B.0.23 m
C.0.48 m
D.2.0 m
E.40 m
7. One mole of a substance contains 6.02 ´ 1023 protons and an equal number of electrons. If the protons could somehow be separated from the electrons and placed in separate containers separated by 1.00 ´ 103 m, what would be the magnitude of the electrostatic force exerted by one box on the other?
A.8.7 ´ 108 N
B.9.5 ´ 109 N
C.2.2 ´ 1010 N
D.8.3 ´ 1013 N
E.1.6 ´ 1019 N
8.

Three charges are positioned as indicated in the figure. What are the horizontal and vertical components of the net force exerted on the +15 µC charge by the +11 µC and +13 µC charges?


horizontal

vertical


A.


95 N

310 N

B.


76 N

310 N

C.


250 N

130 N

D.


95 N

130 N

E.


76 N

370 N

9. A -4.0-µC charge is located 0.30 m to the left of a +6.0-µC charge. What is the magnitude and direction of the electrostatic force on the positive charge?
A.2.4 N, to the right
B.2.4 N, to the left
C.4.8 N, to the right
D.4.8 N, to the left
E.7.2 N, to the right
10. Three identical point charges, Q, are placed at the vertices of an equilateral triangle as shown in the figure. The length of each side of the triangle is d. Determine the magnitude and direction of the total electrostatic force on the charge at the top of the triangle.

A.

B.

C.

D.

E.zero
This is the end of the test. When you have completed all the questions and reviewed your answers, press the button below to grade the test.