Question

How can an iron rod be converted into a magnet by using current carrying solenoid? Describe it by giving suitable diagram.

Answer 1

The right hand rule states that-- in order to deduce the direction of the magnetic force on a positive moving charge, the thumb of the right hand point in the direction of velocity v, the fingers in the direction of magnetic field B, and the force (F) is directed perpendicular to the right hand palm.
Figure shows magnetic field lines around a current carrying solenoid and it is similar to that in bar magnet ( north pole at one end and south pole at the other end). The field lines in this region are parallel and closely spaced making the field is highly uniform in strength and direction.
The coil produces a magnetic field when current flows. This causes the iron molecules in the steel rod to align with the magnetic field. The iron molecules act like little magnets and when they are all aligned the same way, the steel becomes a magnet .