18. A metal sphere of radius R is given a positive charge Q. What is the electric field at a distance r from the center, where r> R? A. Q/nE,r? B. Q/4nE,R? C. Q/4nE,r? D. Q/nE,R? 19. A positive charge of 4.0 µC exerts an attractive force of 8N on an unknown charge 20 cm away. The unknown charge is A.+ 8.9 με B.-8.9 με C. + 44. µC D.- 44 με 20. When you draw the direction of the electric field, you always use a test charge. A. neutral B. negative C. positive D. radioactive
18. A metal sphere of radius R is given a positive charge Q. What is the electric field at a distance r from the center, where r> R? A. Q/nE,r? B. Q/4nE,R? C. Q/4nE,r? D. Q/nE,R? 19. A positive charge of 4.0 µC exerts an attractive force of 8N on an unknown charge 20 cm away. The unknown charge is A.+ 8.9 με B.-8.9 με C. + 44. µC D.- 44 με 20. When you draw the direction of the electric field, you always use a test charge. A. neutral B. negative C. positive D. radioactive
Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter19: Electric Forces And Electric Fields
Section: Chapter Questions
Problem 62P
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