Q.

The magnetic lines of force, inside a current carrying solenoid are:

1 Along the axis and are parallel to each other  
2 Perpendicular to axis and equidistant from each other  
3 Circular and they do not intersect each other  
4 Circular at the ends but they are parallel to the axis inside the solenoid  

Ans.

(1)

The figure shows the magnetic lines of forces the solenoid.