This preview shows pages 1–3. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: song (shs546) Homework 1 weathers (22202) 1 This printout should have 8 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. 001 10.0 points 1) Two uncharged metal balls, X and Y , each stand on a glass rod and are touching. Y X 2) A third ball carrying a positive charge, is brought near the first two. Y X + 3) While the positions of these balls are fixed, ball X is connected to ground. Y X + 4) Then the ground wire is disconnected. Y X + 5) While X and Y remain in touch, the ball carring the positive charge is removed. Y X 6) Then ball X and Y are separated. Y X After these procedures, the signs of the charge q X on X and q Y on Y are 1. q X is positive and q Y is neutral. 2. q X is neutral and q Y is neutral. 3. q X is positive and q Y is positive. 4. q X is negative and q Y is neutral. 5. q X is neutral and q Y is negative. 6. q X is positive and q Y is negative. 7. q X is neutral and q Y is positive. 8. q X is negative and q Y is negative. cor rect 9. q X is negative and q Y is positive. Explanation: When the ball with positive charge is brought nearby, the free charges inside X and Y rearrange themselves. The negative charges are attracted and go to the right ( i.e. move to Y ), whereas the positive charges are repelled and collect in the left hand side of the system X Y , i.e., in X . When we ground X , the positive charges which have collected in X are allowed to es cape (they strive to the left), whereas the negative charges in Y are still held enthralled by the positive charge on the third ball. We break the ground. Now we remove the third ball with positive charge. The charge on Y is redistributed in the system X Y , i.e. they share the negative charge (equally if identical). Finally we separate X and Y . The signs of the charge on X and that on Y are both negative. 002 10.0 points Four point charges, each of magnitude 11 . 71 C, are placed at the corners of a square 26 cm on a side. If three of the charges are positive and one is negative, find the magnitude song (shs546) Homework 1 weathers (22202) 2 of the force experienced by the negative charge. The value of Coulombs constant is 8 . 98755 10 9 N m 2 / C 2 . Correct answer: 34 . 8979 N. Explanation: Let : k e = 8 . 98755 10 9 N m 2 / C 2 , d = 26 cm = 0 . 26 m , and Q = 11 . 71 C = 1 . 171 10 5 C ....
View
Full
Document
This note was uploaded on 04/22/2011 for the course PHYS 2220 taught by Professor Littler during the Spring '00 term at North Texas.
 Spring '00
 Littler
 Charge, Work

Click to edit the document details