Question

I want solution,answer is 2

Answer 1

lt tt chrg be q
it is non cond..
so chrg density per vol.
p = q/(4/3pair^3)
3q/4pair^3 .....eq 1


electric field at dis. two r
e =1/(4pai€)* q/2r....eq2


Q1 charge enclosed = p*vol


=p*4/3pai(r/2)^3
pai/6pai r^3is =pai/6*

3q/(4pai R^3)* R^3
q/q

E1 = 1/(4paiE)* q1/(r/2)^2

1/(4pai)* q/(2r^2)

=2E

Answer 2

Let's assume that the charge be q 

Electric feild at distance r is given by
$E= \frac{1}{4Πε} \frac{q}{r}$
and at distance 2r
$E= \frac{1}{4πε} \frac{q}{2r}$........(i)

Charge density is given by
$p= \frac{q}{4/3πr³}$
$p= \frac{3q}{4πr³}$..........(ii)

So,
=1/(4paiε)* q1/(r/2)^2
=1/(4paiε)* q/(2r^2)
=2E