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# hw01a - aldawsari(ma28683 HW01 Betancourt(16856 This...

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aldawsari (ma28683) – HW01 – Betancourt – (16856) 1 This print-out should have 6 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 21.1-21.4 001 10.0 points A sphere is charged with electrons to - 8 × 10 6 C. The charge of an electron is - 1 . 6 × 10 19 C. How many electrons are there on the sphere? Correct answer: 5 × 10 13 . Explanation: Let : q = - 8 × 10 6 C and q e = - 1 . 6 × 10 19 C . The total charge is q = n q e n = q q e = - 8 × 10 6 C - 1 . 6 × 10 19 C = 5 × 10 13 . 002 10.0 points A neutral ball is suspended by a string. A positively charged insulating rod is placed near the ball, which is observed to be at- tracted to the rod. This is because 1. the ball becomes positively charged by induction. 2. the number of electrons in the ball is greater than in the rod. 3. the ball becomes negatively charged by induction. 4. there is a rearrangement of the electrons in the ball. correct 5. the string is not a perfect conductor. Explanation: If a positively charged insulator is brought close to a conductor, it will attract some of the free electrons of the conductor closer to the insulator.

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