A nonconducting thin spherical shell of radius 6.36 cm has a uniform surface charge density of 8.41 nC/m2. What is the total charge on the shell?
What is the magnitude of the electric field at a distance of 4.99 cm from the center of the shell?
What is the magnitude of the electric field at a distance of 7.89 cm from the center of the shell?
charge density = charge / area
8.41 = Q / ( 4* pi * 0.0636^2)
Q = 0.4273 nC
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using Gauss law
E* A = charge enclosed / epsilon_not
since not charge enclosed inside the shell, so Q = 0
hence E = 0 N/C
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E = k q / r^2
E = 9*10^9* 0.4273*10^-9 / 0.0789^2
E = 617.71 N/C
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Do comment in case any doubt, will reply for sure . Goodluck
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