A spherical cloud

A Spherical cloud of charge or radius R contains a total charge +Q with a nonuniform charge density that varies according to:

p(r)=p0)for r<_ R

and p=0 for r>R

Where r is the distance from the center of the cloud

Express all algebraic answers in terms of Q,R,r and fundamental constants,

(a) A proton is placed at point P and released. Descrive its motion for a long time after it's release,


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