a) Electric Field b) Electric Dipole c) Electric Charge 3. Three charges are placed as shown to the right. a. What is the magnitude of the field at and force on the 3 mC +1 mC charge? 0.030 m 0.030 m b. What would be the approximate force on the 3 mC charge if it were moved up 5 m above where it is currently? Answer this with minimal calculation and explain your reasoning. 0.050 m +3 mC 0.040 m 0.050 m -2 mC

a) Electric Field b) Electric Dipole c) Electric Charge 3. Three charges are placed as shown to the right. a. What is the magnitude of the field at and force on the 3 mC +1 mC charge? 0.030 m 0.030 m b. What would be the approximate force on the 3 mC charge if it were moved up 5 m above where it is currently? Answer this with minimal calculation and explain your reasoning. 0.050 m +3 mC 0.040 m 0.050 m -2 mC

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter5: Electric Charges And Fields

Section: Chapter Questions

Problem 101P: In this exercise, you practice electric field lines. Make sure you represent both the magnitude and...

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Many textbooks claim Franklin decided that moving charged particles are positive. How would you correct this claim? Think about these questions in developing your answer: Did Franklins model include particles? What did the terms positive and negative mean to Franklin?
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A representation of an electric field shows 10 field lines perpendicular to a square plate. How many field lines should pass perpendicularly through the plate to depict a field with twice the magnitude?
(i) A metallic coin is given a positive electric charge. Does its mass (a) increase measurably, (b) increase by an amount too small to measure directly, (c) remain unchanged, (d) decrease by an amount too small to measure directly, or (e) decrease measurably? (ii) Now the coin is given a negative electric charge. What happens to its mass? Choose from the same possibilities as in part (i).
A simple and common technique for accelerating electrons is shown in Figure 18.55, where there is a uniform electric field between two plates. Electrons are released, usually from a hot filament, near the negative plate, and there is a small hole in the positive plate that allows the electrons to continue moving. (a) Calculate the acceleration of the electorn if the field strength is 2.50104 N/C. (b) Explain why the electron will not be pulled back to the positive plate once it moves through the hole.
In this exercise, you practice electric field lines. Make sure you represent both the magnitude and direction of the electric field adequately. Note that the number of lines into or out of charges is proportional to the charges. (a) Draw the electric field lines map for two charges +20C and 20C situated 5 cm from each other. (b) Draw the electric field lines map for two charges +20C and +20C situated 5 cm from each other. (c) Draw the electric field lines map for two charges +20C and 30C situated 5 cm from each other.
Rocket observations show that dust particles in Earths upper atmosphere are often electrically charged. (a) Find the distance separating two dust particles if each has a charge of +e and the Coulomb force between them has magnitude 1.00 1014 N. (b) Calculate the mass of one of the dust panicles if this Coulomb force would accelerate it at 4.50 108 m/s2. (In the upper atmosphere, effects from other nearby charges typically result in a small net force and acceleration.)
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Compare and contrast the Coulomb force field and the electric field. To do this, make a list of five properties for the Coulomb force field analogous to the five properties listed for electric field lines. Compare each item in your list of Coulomb force field properties with those of the electric field—are they the same or different? (For example, electric field lines cannot cross. Is the same true for Coulomb field lines?)
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