Given, radius of hollow cylinder =R Current =i Distance from axis =T Let magnetic field be B. ∵ No current is passing through region r<R and magnetic field (B)=
1
2π
µ0I
r
So,B(r<R)=0 B(r=R)=
1
2π
µ0I
R
and B(r>R)=
1
2π
µ0l
r
So, these variations are correctly shown as below.
