Answer:
E = 0
Explanation:
Given data
r = r1
r = r0
to find out
electric field 0 < r < r1
solution
for function 0 < r < r1 there is no electric filed
because no charge is inclose here so we can say
electric field
E = 0
the electric field as a function of r for 0 < r < r1 is 0