7 - Copy (2)

7 - Copy (2) - Version 021/AABBB inclasstest 01...

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Version 021/AABBB – inclasstest 01 – Turner – (56705) 1 This print-out should have 3 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 (part 1 oF 2) 10.0 points Three charges are arranged as shown in the fgure. x y 3 . 3 nC 3 . 5 m 0 . 6 nC 1 . 2 nC 2 m ±ind the magnitude oF the electro- static Force on the charge at the origin. The Coulomb cosnstant is 8 . 98755 × 10 9 N · m 2 / C 2 . 1. 2.09217 2. 1.8867 3. 2.17427 4. 1.94989 5. 2.06574 6. 2.20897 7. 2.02736 8. 1.92891 9. 1.90706 10. 1.99886 Correct answer: 2 . 17427 nN. Explanation: Let : ( x 0 , y 0 ) = (0 m , 0 m) , q 0 = 0 . 6 nC , ( x 1 , y 1 ) = (3 . 5 m , 0 m) , q 1 = 3 . 3 nC , ( x 2 , y 2 ) = (0 m , 2 m) , and q 2 = 1 . 2 nC . x y q 1 x 1 q 0 q 2 y 2 F θ The Force v F 10 (in the h 10 direction, ˆ ı ) be- tween charge 6 × 10 10 C and 3 . 3 × 10 9 C is v F 10 = + k e q 0 q 1 x 2 1 ( ˆ ı ) = ( 8 . 98755 × 10 9 N · m 2
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7 - Copy (2) - Version 021/AABBB inclasstest 01...

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