Find charge inner/hollow sphere

  • Thread starter g98
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  • #1
g98
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Homework Statement


A hollow conducting sphere with an inner radius of 5 cm and an outer radius of 6 cm contains a smaller sphere of radius 3 cm, located symmetrically inside the hollow sphere. The electric field strength at 4 cm from the center is measured to be 2400 N/C pointing inward. The electric field strength at 20 cm from the center is determined at 300 N/C pointing away from the spheres. Use this information to determine: a. the charge on the inner sphere b. the charge on the hollow sphere

Homework Equations




The Attempt at a Solution


I know I have to use the gauss's law but I am not quite sure how to do it
 

Answers and Replies

  • #2
ehild
Homework Helper
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Homework Statement


A hollow conducting sphere with an inner radius of 5 cm and an outer radius of 6 cm contains a smaller sphere of radius 3 cm, located symmetrically inside the hollow sphere. The electric field strength at 4 cm from the center is measured to be 2400 N/C pointing inward. The electric field strength at 20 cm from the center is determined at 300 N/C pointing away from the spheres. Use this information to determine: a. the charge on the inner sphere b. the charge on the hollow sphere

Homework Equations




The Attempt at a Solution


I know I have to use the gauss's law but I am not quite sure how to do it
You have to show some attempt at solving the problem. What does Gauss' Law state?
 
  • #3
PKM
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Consider first a gaussian surface of radius ##r## cm with ##3\lt r\lt 5##, and try to apply gauss's law. Also note that if ##Q## be the charge of the inner sphere, the inner surface of the spherical shell must have charge ##-Q##.
 
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