Date: Name: Class:
Assessment /

Chapter 14 Test

Chapter 14
BLM 14-6

Goal

/ Assess your understanding of the concepts presented in Chapter 14.
Procedure / Answer the following questions, showing all steps in your calculations.
1. A point charge of +9.0 mC exerts a repulsive force of 0.60 N on a nearby point charge of magnitude 4.0 mC.
(a) What is the sign of the second charge?
(b) How far apart are the two point charges?
2. Two identical objects have charges of – 4.0 nC and +8.0 nC. When they are a distance d apart, the force between them has a magnitude of 3.0 N. The objects are touched together and then separated again, this time by a distance of 0.5d.
(a) Was the original force attractive or repulsive? Give a reason for your answer.
(b) Was the final force attractive or repulsive? Give a reason for your answer.
(c) What is the magnitude of the final force?
3. Explain how the data in an experiment to verify Coulomb’s law can be analyzed to produce a straight-line graph.
4. (a) List two ways in which electric, gravitational, and magnetic forces
are similar.
(b) List one way in which each force is different from the other two.
5. The gravitational field intensity on the surface of Jupiter is 26 N/kg. What gravitational force would a 4.0 kg object experience 2000.0 km above the surface of Jupiter? The radius of Jupiter is 7.18 ´ 107 m.
6. In the diagram, A and B represent small spherical charges of +56 mC and
–34 mC, respectively. What is the magnitude and direction of the
electric field intensity at point C?

7. (a) Sketch the gravitational field line pattern of Earth and the Moon, given that Earth has a mass that is approximately 100 times that of the Moon.
(b) Explain how you might do a vector analysis at one point on a field line
to verify its direction, assuming that you had all relevant mass and
distance data.
8. Points A and B are 4.8 cm and 7.2 cm away from a point charge of –6.2 mC
at point C. AC and CB are at right angles.
(a) How much work must be done in moving a 2.0 pC charge from A to B?
(b) What is the potential difference between points A and B?
(c) Which of these two points has the higher potential difference? Explain
your answer.

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