Question

With the help of a labeled diagram illustrate the pattern of magnetic field lines of the magnetic field around a current carrying straight long conducting wire. How is the right hand thumb rule useful to find direction of magnetic field associated with a current carrying conductor?

Answer 1

Right hand thumb rule states that when an electric current passes through a straight wire that is held by the right hand with the thumb pointing upwards and the fingers curling up the wire showing the co-centric field around conductor, the thumb points in the direction of the conventional current (from positive to negative), and the fingers point in the direction of the magnetic field.
Given figure represents the direction of current and magnetic field through a straight current carrying conductor.