Electromagnetism - Gauss' Law




An isolated sphere of radius R contains a uniform volume distribution of positive charge. Which of the curves on the graph above correctly illustrated the dependence of the magnitude of the electric field of the sphere as a function of the distance r from its center?

A. A
B. B
C. C
D. D
E. E
(GR8677 #10)
Solution:

The graph shows different lines for condition inside the solid sphere, r  R

Gauss’ Law:  


Inside the sphere:






E is linearly proportional to r.

Answer: C

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