Practice Problems
Charging
Directions:
On this worksheet you will continue working with charges at rest.
omit
Question 1
A metal sphere has a net negative charge of 4.8 × 10
-6
coulomb. Approximately how many more electrons than protons are on the sphere?
3.33 x 10
18
electrons
3 x 10
13
electrons
7.68 x 10
11
electrons
1.3 x 10
24
electrons
omit
Question 2
Two protons are located one meter apart. Compared to the gravitational force of attraction between the two protons, the electrostatic force between the protons is
stronger and also attractive
stronger and repulsive
weaker and repulsive
weaker and also attractive
omit
Question 3
In the diagram below, a positive charge is located between two charged spheres, A and B. Sphere A has a charge of +2q and is located 0.42 meter from the central charge. Sphere B has a charge of –2q and is located 0.14 meters from the central charge.
If the magnitude of the force on the central charge due to sphere A is
F
, then what is the magnitude of the force on the central charge due to sphere B?
12.76 F
1.11 x 10
-1
F
3 F
9 F
1.96 x 10
-2
F
omit
Question 4
When a neutral metal sphere is charged by contact with a negatively charged amber rod, the sphere
gains electrons
gains protons
loses protons
loses electrons
omit
Question 5
Two similar metal spheres, A and B, have charges of +2.0 × 10
–6
coulomb and +1.0 × 10
–6
coulomb. The magnitude of the electrostatic force on A due to B is 4.8 newtons. What is the magnitude of the electrostatic force on B due to A?
2.4 N
0 N
4.8 N
9.6 N
omit
Question 6
Which of the following demonstrations was not a result of charge polarization?
a wooden stick being rotated on the watch glass by a charged balloon
the spark created by the Kelvin water drop generator
a charged balloon sticking to a ceiling tile
tiny pieces of paper confetti being 'scattered' by a charged balloon
a water stream 'bending' towards a charged balloon
omit
Question 7
Metal sphere A has a charge of –4 units and an identical metal sphere, B, has a charge of +6 units. If the spheres are brought into contact with each other and then separated, the charge on sphere B will be
+5 units
+1 units
+2 units
10 units
omit
Question 8
What is the net electrical charge on a magnesium ion that is formed when a neutral magnesium atom loses two electrons?
+1.6 x 10
-19
C
-1.6 x 10
-19
C
-3.2 x 10
-19
C
+3.2 x 10
-19
C
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