Question

Why does a current carrying conductor expevidences a force when it is placed in a magnetic field

Answer 1

when a current carrying conductor is placed in a magnetic field , a mechanical force is exerted on the conductor which can make the conductor move.

Answer 2

When a current-carrying conductor is placed in a magnetic field the wire experiences a force due to the interaction between the field and the magnetic field produced by the moving charges in the wire.

The current carrying conductor generates it own magnetic field around it. This interracts with the external magnetic field. When two magnetic fields interact there will be attraction and repulsion between them based on the direction of the external magnetic field and the direction of the current in the conductor. That is why the conductor experiences a force.