question_answer

A sphere of radius R is made up of uniform!] distributed positive change of a distance r from the centre of the sphere and inside the sphere, the electric field is proportional to which one of the following?

A)  \[{{r}^{-2}}\]                                    

B)  \[{{r}^{-1}}\]

C)  \[r\]                                     

D)  \[{{r}^{2}}\]

E)  The electric field does not depend on the distance r from the centre

Correct Answer: A

Solution :

                The variation of electric field  with respect  distance r is given below