Charge is distributed within a sphere of radius R with a volume charge density
(r)= e^{−2r/a }Where A and are constant. If Q is the total charge of this charge distribution, the radius R is
a. 

b. 

c. 

d. 

Charge is distributed within a sphere of radius R with a volume charge density
(r)= e^{−2r/a }Where A and are constant. If Q is the total charge of this charge distribution, the radius R is
a. 

b. 

c. 

d. 
