A long cylindrical copper rod carries a direct current, the magnetic field associated with the rod will be :

Question

A long cylindrical copper rod carries a direct current, the magnetic field associated with the rod will be : (A) inside the rod only (B) outside the rod only (C) both inside and outside (D) neither inside nor outside the rod

Tardigrade Admin · Accepted Answer

For solid rod ,there will be current flowing inside the rod , so there will be magnetic field (Ampere circuital law). There will magnetic field outside the rod and it will decrease as we increase the distance .

Q. A long cylindrical copper rod carries a direct current, the magnetic field associated with the rod will be :

inside the rod only

outside the rod only

both inside and outside

neither inside nor outside the rod

For solid rod ,there will be current flowing inside the rod , so there will be magnetic field (Ampere circuital law). There will magnetic field outside the rod and it will decrease as we increase the distance .