Question

Draw the pattern of the magnetic field lines due to a straight current carrying conductor indicating the direction of current in the conductor and the direction of the corresponding magnetic field lines.

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 ?