 #1
rudransh verma
Gold Member
 1,067
 91
 Homework Statement:

The volume charge density of a solid non conducting sphere of radius R= 0.056 m varies with radial distance r as given by rho=35.4r/R pC/m^3.
What is the sphere total charge?
What is the field magnitude E at r=0, r=R/3, r=R ?
 Relevant Equations:

V= 4/3 pir^3
E=1/4pie0q/r^2
First I did drho/dr which is equal to 35.4*10^12/R. Then I integrated drho by which I got rho=35.4*10^12. And then the last eqn will be q=rhoV. But the answer was wrong.
I have a doubt on the formula I am using for E because that formula is for a point charge or a charged shell.
I have a doubt on the formula I am using for E because that formula is for a point charge or a charged shell.