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1. Two point-charges exert a 4 N force on each other. What will the force become if the distance between them is increased by a factor of three? Hint: What are different ways to solve this problem? Can you identify the relationship between the Coulomb force and the distance between the charges? Force = N Sense-making: Does your answer make sense? Should the magnitude of force increase or decrease as the distance between the charges increases?

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QUESTION 13 When the distance between two stationary point charges is tripled while the charge on each particle is doubled, how does the final force between the charges compare to the initial force between the charges? a. The final force is one-ninth of the initial force b. The final force is two-thirds as large as the initial force. C. The final force is as large as the initial force. d. The final force is nine times larger than the initial force. e. The final force is four-ninths of the initial force.

A proton is moving in an electric field. The direction of the acceleration of the proton is Select one: a. opposite the direction the proton is moving. Ob. perpendicular to the direction the proton is moving. Oc. in the direction the proton is moving. d. in the direction of the electric field. e. opposite the direction of the electric field.

An object has positive electric charge whenever; A It has an excess of electrons. B) The nucleus of the atom is positively charge. The nucleus of the atom is negatively charge. D It has a deficiency of electrons.

When two point charges are 2.0 cm apart, each one experiences a 1.0-N electric force due to the other charge. If they are moved to a new separation of 8.0 cm, the electric force on each of them is closest to O none of the given choices O 1.0 N. O 0.063 N. O 4.0 N. O 0.25 N.

A conducting sphere is intially neutally charged. Its grounded, meaning the sphere has a direct path to earth ground. Which of the following describes the flow of electrons when a positvely charged rod is broght near the sphere? a. Electrons flow within the sphere but do not go into or out of the ground. b. Electrons flow out of the ground and into the sphere. c. Electrons flow out of the sphere and into the ground. d. There is no flow of electrons.

The electric force between two stationary charged particles is a. inversely proportional to the magnitude of the charges. O b.inversely proportional to the separation r between the charges. O. (a) and (c). O d. directly proportional to the magnitude of the charges.

The ratio of the electrostatic force to the gravitational force is different between two electrons and two protons. Why? I. The magnitude of the fundamental charge of an electron is different from a proton. II. Electrons and protons have different masses. III. False. The ratio is the same     A. III only B. Both I and II only C. II only D. I only