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HbqbSE4nhKCV_1210016540_jwk572

# HbqbSE4nhKCV_1210016540_jwk572 - tween the two spheres at...

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inclasstest 01 – KIM, JI – Due: Jan 23 2008, 1:00 pm 1 Question 1, chap -1, sect -1. part 1 of 1 1 points This is a question for showing your atten- dance. Please choose the correct answer be- low, or you will lose 25% of this weekly test. 1. This is the correct answer. correct 2. This is the wrong answer. Explanation: Question 2, chap 22, sect 2. part 1 of 1 3 points There are two identical small metal spheres with charges 15 . 5 μ C and - 13 . 5 μ C. The distance between them is 9 cm. The spheres are placed in contact then set at their original distance. The value of the Coulomb constant is 8 . 98755 × 10 9 N · m 2 / C 2 . Calculate the magnitude of the force be-
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Unformatted text preview: tween the two spheres at the Fnal position. Correct answer: 1 . 10957. Explanation: Let : q A = 15 . 5 μ C = 1 . 55 × 10-5 C , q B =-13 . 5 μ C =-1 . 35 × 10-5 C , and d = 9 cm = 0 . 09 m . When the spheres are in contact, the charges will rearrange themselves until equi-librium is reached. Each sphere will then have half of the original total charge: q = q A + q B 2 = 1 . 55 × 10-5 C-1 . 35 × 10-5 C 2 = 1 × 10-6 C . The force between the two spheres is F = k q 2 d 2 = ( 8 . 98755 × 10 9 N · m 2 / C 2 ) × (1 × 10-6 C) 2 (0 . 09 m) 2 = 1 . 10957 N ....
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