4. Find the magnetic field at a point r=in the inner conductor A) H B) Hol πα Σπα C) Hol Απα D) Hol бла E) 0 5. Find the magnetic field at a point r (a<r<b) in between the two conductors. A) Hol Hol B) Σπα 2πr C) HD) - E) O 6. Find the magnetic field at a point r (b<r<c) within the outer conductor A) 0 B) Hol 2πr Hol 2πr C) (1- r2-b2. c2-b2 D) (1+ 2mr a r2-b², c2-b2- E) None of above