Draw the pattern of magnetic field lines due to a current-carrying solenoid. Clearly mark the north and south poles in the diagram.

(N/A) The magnetic field lines produced by a current-carrying solenoid are similar to those of a bar magnet. Inside the solenoid,the field lines are parallel to the axis,indicating a uniform magnetic field. Outside,they form closed loops. The end from which the field lines emerge is the North pole $(N)$,and the end where they enter is the South pole $(S)$.