9. What is the magnitude of the electric field in the center of a ring with radius a having a charge Q uniformly distributed around it? a. Zero b. kQ/2x c. kQ/a? d. kQ/2a Solution:

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4. Find the value of the electric field at a distance r=10 cm from the center of a non-conducting sphere of radius R=1 cm which has an extra positive charge equal to 7 C uniformly distributed within the volume of the sphere. c. 7.5 x 10-6 N/C d. 9.1 x 10-3 N/C 5. A positive charge is placed inside a spherical metallic shell with inner radius a and outer radius b. The charge is placed at shifted position relative to the center of the shell. Describe the a. 6.3 x 1012 N/C 1.2 x 100 N/C b. charge distribution induced at the shell surfaces. A negative charge with uniform surface density will be induced on the inner surface; a positive charge will be induced on the outer surface. а. A negative charge with non-uniform surface density will be induced on the inner surface; a positive charge will be induced on the outer surface. b. A positive charge with uniform surface density will be induced on the inner surface, a negative charge will be induced on the outer surface. A positive charge with…

1 I. The electric field 0.400 m from a very long uniform line of charge is 840 N/C. How much charge is contained in a 2.00-cm section of the line?