Set 1- Electrostatics

# Set 1- Electrostatics - Ashley Katherine Thompson PHY 232...

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Ashley Katherine Thompson - PHY 232 Spring 20 1 Set 01 (01/17) Due date: Wed Jan 17 23:59:00 2007 What is the total charge of the thorium nucleus? (The neutral thorium atom has 90 electrons.) You are correct. Your receipt is 162-2768 What is the magnitude of its electric field at a distance of 8 . 38 × 10 - 10 m from the nucleus? You are correct. Your receipt is 162-2397 What is the magnitude of the force on an electron at that distance? You are correct. Your receipt is 162-2367 What would the magnitude of the force be if the distance of the electron from the nucleus were tripled? You are correct. Your receipt is 162-2709 It is known that the electric force of repulsion between two electrons is much stronger than the gravitational attraction. For two electrons at a distance r apart, calculate the ratio of the size of the electrostatic repulsion to that of the gravita- tional attraction. Use the following data: k = 8 . 99 × 10 9 Nm 2 /C 2 , e = 1 . 60 × 10 - 19 C, G = 6 . 67 × 10 - 11 Nm 2 /kg 2 , m e = 9 . 11 × 10 - 31 kg. You are correct. Your receipt is 162-1983 Q Q 3 Q 1 R R 2 Three charges are arranged on a line as shown above. Choices: True , False . A. If Q 1 is negative, Q 2 is negative and Q 3 is positive, then Q 2 MUST feel a net force to the right. B. If Q 1 is positive, Q 2 is negative and Q 3 is negative, then Q 2 MUST feel a net force to the right. C. If Q 1 is positive, Q 2 is negative and Q 3 is positive, then Q 2 MIGHT feel a net force to the right.

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