The magnetic field lines in the middle of the current-carrying solenoid are :

Classify in to true or false. : a) The magnetic field in the middle of current carry ing solenoid depends up on cross sectional area. b) The magnetic field depends up on current. c) The magnetic field depends up on the material of the core. d) The magnetic field depends up on total numbers of turns per unit length.

What does the divergence of magnetic field lines near the end of a current-carrying straight solenoid indicate ?