Question

The pattern of the magnetic field produced inside a current carrying solenoid is :

The current carrying device which produces a magnetic field similar to that of a bar magnet is :

What happens when a bundle of wires of soft iron is placed inside the coil of a solenoid carrying a steady current ? Name the device obtained. Why is it called so ?

Draw the magnetic field lines inside a current carrying solenoid. What does this pattern of magnetic field lines indicate ?