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Problem 1 (15 pts). You have seen in lecture 2 that there are similarities between the electric force and the gravitational force. Which of the following statements about them is correct (a) The gravitational force is much stronger. (b) Both the electric force and the gravitational force are always attractive. (c) Both the electric force and the gravitational force act only on charged particles. (d) The electric force is generally much stronger than the gravitational force and can be either attractive or repulsive. For this problem simply write doun your letter choice. Correct answers will be given 15 pts f your answer is wrong you will lose 5 pts. If no answer is written you will be given 0 pts for this question Problem 2 (35 pts). Consider the following 2 configurations of point charges Qi and Q (a) Q.-10,1C and Q2--5tC. These charges are located at positions ri-(1,2,3) and 疫= (-5,0, lo) respectively. Calculate the force F12 on charge Q1 due to charge Q2. (b) Q.-10,C and Q2-5pC. These charges are located at positions ri-(1.2.3) and (-5,0, 10) respectively. Calculate the force Fiz on charge Qi due to charge Q Problem 3 (25 pts). A balloon is negatively frictionally charged by rubbing. It is held near to the surface of a wall which it then clings to. Does this mean that the wall is positively charged? Why does the balloon eventually fall? Give an answer in less than 50 words.

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e are much stvemger than elecotncal ferces で2- Compoa+vely Neg 3tble C 0 39.62)

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