A point charge q is located at the center of a spherical shell of radius a that
ID: 1394905 • Letter: A
Question
A point charge q is located at the center of a spherical shell of radius a that has a charge -q uniformly distributed on its surface.
Find the electric field for the following points: (a) for all points outside the spherical shell:
(Please explain how you got each answer step by step and why the answer is the correct one. Thank you.)
1) E = 0
2) none of these
3) E = kq/r2
4) E = kq2/r2
5) E = q/4?r2
(b) for a point inside the shell a distance r from the center
1) E = q/4?r2
2) E = kq/r2
3) E = kq2/r2
4) none of these
5) E = 0
Explanation / Answer
(a) For points outside the sphere
net charge = 0
Electric field outside the sphere = 0 ( since net charge is zero)
b) Inside the sphere , net charge = q
Electric field = k q / r^2
Answer is Option 2) E = kq/r2
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