1. Which one of the following statements best explains why tiny bits of paper ar
ID: 1731556 • Letter: 1
Question
1. Which one of the following statements best explains why tiny bits of paper are attracted to a charged rubber rod? A) Paper is naturally a positive material. B) Paper is naturally a negative material. C) The paper becomes electrically polarized by induction. D) Rubber and paper always attract each other. E) The paper acquires a net positive charge by induction. 2. A conducting sphere has a net charge of -6.4 x 1017 C. What is the approximate number of excess electrons on the sphere? A) 100 B) 200 C) 300 D) 400 ?) 500 3. Four point charges, each of the same magnitude, with varying signs are arranged at the corners of a square as shown. Which of the arrows labeled A, B, C, and D gives the correct direction of the net force that acts on the charge at the upper right corner? A) A ?) ? C) C D) D E) The net force on that charge is zero. 4. At what separation will two charges, each of magnitude 6.0 uC, exert a force of 0.70 N on each other? A) 1.1 x 10- m B) 0.23 m C) 0.48 m D) 0.68 m E) 1.4 m 5. Three charges are positioned as indicated in the figure. What are the horizontal and vertical components of the net force exerted on the +15 pC charge by the +11 ?C and +13 ?C charges?Explanation / Answer
1)
Option (c) : the paper becomes polarized by induction.
2)
Number of electrons = (6.4 x 10^-17)/(1.6 x 10^-19) = 400
3)
Correct answer is option (B) . The arrows A and C indicate the directions of attractive forces exerted by the positive charges. All charges charges being equal, the repulsive force from the negative charge is weaker.
4)
F = k q*q/r^2 = k q^2/ r^2
0.7 = (9 x 10^9)(6 x 10^-6)^2/ r^2
Distance, r = 0.68 m
Correct answer is option (d)
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