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Chapter 21 Solutions

# Chapter 21 Solutions - wright(daw2557 Chapter 21 de(14443...

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wright (daw2557) – Chapter 21 – de – (14443) 1 This print-out should have 3 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0points Two identical positive charges exert a repul- sive force of 6 . 8 × 10 9 N when separated by a distance 3 . 7 × 10 10 m. Calculate the charge of each. The Coulomb constant is 8 . 98755 × 10 9 N · m 2 / C 2 . Correct answer: 3 . 21837 × 10 19 C. Explanation: Let : F = 6 . 8 × 10 9 N , d = 3 . 7 × 10 10 m , and k e = 8 . 98755 × 10 9 N · m 2 / C 2 . The electric force is F = k e q 1 q 2 d 2 d 2 F k e = q 2 q = radicalBigg d 2 F k e = radicalBigg (3 . 7 × 10 10 m) 2 (6 . 8 × 10 9 N) 8 . 98755 × 10 9 N · m 2 / C 2 = 3 . 21837 × 10 19 C . 002 10.0points A particle with charge - 6 μ C is located on the x -axis at the point 10 cm , and a second particle with charge - 6 μ C is placed on the x -axis at - 8 cm . The Coulomb constant is 8 . 9875 × 10 9 N · m 2 / C 2 . 2 4 6 8 10 - 2 - 4 - 6 - 8 - 10 - 6 μ C - 6 μ C - 9 μ C x (cm) What is the magnitude of the total elec-

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