Quiz_1_B

# Quiz_1_B - PHYSICS 1B QUIZ#1 FALL QUARTER 2005 B YOUR NAME...

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PHYSICS 1B QUIZ #1 FALL QUARTER 2005 B YOUR NAME _________________________________________________________________ YOUR IDENTIFICATION NUMBER______________________________________________ INSTRUCTIONS: THERE ARE 10 QUESTIONS ON THIS QUIZ. PLEASE FILL IN THE SCANTRON FORM USING A NUMBER 2 PENCIL. PUT YOUR NAME, STUDENT ID AND THE IDENTIFICATION NUMBER YOU WERE ASSIGNED IN THE SPACES ABOVE. NO NOTES OR CALCULATORS, CELL PHONES, LAPTOPS ETC ALLOWED. Note: Any confirmed case of cheating will result in an “F” grade in Physics 1B and referral to the dean for disciplinary action . 1. The average distance of the electron from the proton in the hydrogen atom is 0.51 × 10 10 m. What is the electric field from the proton’s charge at the location of the electron? ( k e = 8.99 × 10 9 N m 2 /C 2 , e = 1.6 × 10 19 C) a. 5.5 × 10 11 N/C b. 1.0 × 10 6 N/C c. 3.2 × 10 2 N/C d. 8.8 × 10 8 N/C 2. A charge of +2 C is at the origin. When charge Q is placed at 2 m along the positive x axis, the electric field at 2 m along the negative x axis becomes zero. What is the value of Q ? 3. A ping-pong ball covered with a conducting graphite coating has a mass of 5.0

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