Chapter 14Ee Charge and Eleetrle b. one quarter as large e. one-eighth as large

Question

Chapter 14Ee Charge and Eleetrle b. one quarter as large e. one-eighth as large d, double e. four imes larger r. eight times larger 30 pts. (14) Three charged particles are arranged in a line as shown in the figure be Calculate the electrostatic force on particle Q2. Answer Chapter 17-Electric Potential 10 pts. (15) When two positively charged small spheres are pushed a other, what happens to their electric potential energy, P.E.? (Circle a. It remains the same b. It decreases c. It increases d. There is no potential energy in this situation.

Explanation / Answer

13)

Use Coulomb’s law

F=kq1q1/r2

Thus F ? 1/r2

Hence,

F1/F2 = r22/r22

We are given, r2/r1 = 2 F1= F

Plug these values in above eqn,

F/F2 = (2)2

Gives,

F2 = F/4

F2 is one-quarter as large of F

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