# capa 2 - 1[1pt A person scuffing her feet on a wool rug on...

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1. [1pt] A person scuffing her feet on a wool rug on a dry day accumulates a net charge of - 42.1uC. How many excess electrons does this person get? Correct, computer gets: 2.63e+14 2. [1pt] By how much does her mass increase? Correct, computer gets: 2.40e-16 kg 3. [1pt] Three charges are arranged on a line as shown above. (For each statement select T True, F False). A) If Q 1 is positive, Q 2 is negative and Q 3 is negative, then Q 2 MUST feel a net force to the right. B) If Q 1 is positive, Q 2 is negative and Q 3 is positive, then Q 2 MUST feel a net force to the right. C) If Q 1 is negative, Q 2 is negative and Q 3 is positive, then Q 2 MUST feel a net force to the right. D) If Q 1 is positive, Q 2 is negative and Q 3 is positive, then Q 2 MIGHT feel a net force to the right. Correct, computer gets: FFTT 4.[1pt] Two small spheres with charges -4 C and -9 C are held 9.5 m apart. Find the magnitude of the force between them.

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Correct, computer gets: 3.59E+09 N Hint: This is an application of Coulomb's Law. 5.[1pt] Four charges Aq,Bq,Cq, and Dq (q = 3.50 x 10 -07 C) sit in a plane at the corners of a square whose sides have length d = 63.0 cm, as shown in the diagram below. A charge, Eq, is placed at the origin at the center of the square. DATA: A = 4, B = 6, C = 3, D = 6, E = 4. Consider the charge at the center of the square. What is the x-component of the net force on this charge? Correct, computer gets: 1.57E-02 N
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capa 2 - 1[1pt A person scuffing her feet on a wool rug on...

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