Spherical charge distribution to generate this E-field

[Mohomad]

Homework Statement

spherical volume charge

Relevant Equations

Gauss

A spherical volume charge (R<=1cm) with uniform density ρv0 is surrounded by a spherical surface charge ( R=2cm) with charge density 4 C/m2. If the electric field intensity at R=4cm is 5/Є0 ,deterime ρv0

 

[berkeman]

Welcome to PhysicsForums.

Per the PF rules, we cannot offer any tutorial help until you show us your best efforts to work the problem. What equation(s) do you think you should use in these calculations?

 

[Mohomad]

Ok. I am new in forum. Sorry about that. I tried hard but couldn't find the solution. I know equations but i cannot find

 

[berkeman]

Show us how you tried to start the calculation. What equation is the best one to use to start this problem? Please also have a look at the LaTeX Guide link at the lower left of the Edit window -- it's best to post your equations using LaTeX. Thank you.

 

[Mohomad]

Ok. I will post here. Thank you for your help

 

[Mohomad]

 

[Mohomad]

sorry, ı am new in electromagnetic and it is so difficult for me

 

[Gordianus]

It seems you know something about Gauss' Law but you made some mistakes when you computed Q1 and Q2. Q1 comes from a volume distribution whereas Q2 comes from a surface distribution. The scanned page shows some confusion about this point.

 

[Mohomad]

ok. Where else could I have a fault

 

[Gordianus]

I'd say the scanned page is just a sketch and I find it difficult to read. Please, try to post your ideas first and make a more detailed attempt.

 

[Mohomad]

 

[Mohomad]

ı found pvo=1900. is there a wrong calculation? please write me

 

[Gordianus]

Some thoughts:
1)The numbers, and just the numbers, are OK but:
2) 5/epsilon0 can't be an electric field. Units don't match.
3) Please; use units!
4) Did you find rho= 19 C/m3 or 1900 C/m3?
5) Please, write down the ideas behind your reasoning.

 

[haruspex]

ı found pvo=1900.

Check the order of magnitude in your final step to that.