A long copper tube of inner radius `R` carriers a current `i`. The magnetic field `B` inside the tube is

If a long hollow copper pipe carries a current, then magnetic field is produced:

If a long hollow copper pipe carriers a direct current, the magnetic field associated with the current will be:

If a long hollow copper pipe carriers a direct current, the magnetic field associated with the current will be:

If a long hollow copper pipe carriers a direct current, the magnetic field associated with the current will be:

If a long hollow copper pipe carriers a direct current, the magnetic field associated with the current will be:

If a long hollow copper pipe carries a current, the magnetic field produced will be

If a long copper rod carries a direct current, the magnetic field associated with the current will be