Which of the following statements are correct? <br><br> 1. The magnetic lines of force are always continuous loops, so they are endless.<br> 2. The lines of force always starts from the south pole to north pole <br> 3. Soft iron core is generally not preferred for solenoid<br> 4. Force of the moving charge is maximum when it moves perpendicular to the direction pf the magnetic field.

Question

$\begin{array}{1 1} (a)\;\text{1 and 2 } \\ (b)\; \text{2 and 3 } \\ (c)\text{2 and 4}\\ (d) \text{1 and 4} \end{array}$