With the help of a labelled circuit diagram, illustrate the pattern of 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?

Explanation

Magnetic field around a current carrying straight long conducting wire :
The magnetic field lines around a straight conductor (straight wire) carrying current are concentric circles whose centres lie on the wire.

Right Hand Thumb Rule :
Right Hand Thumb Rule states that if a current carrying straight conductor is supposedly held in the right hand with the thumb pointing towards the direction of current, then the fingers will wrap around the conductor in the direction of the field lines of the magnetic field.
Using the right-hand thumb rule, if we point thumb down wards in the direction of the current, the magnetic field would be represented by the curled fingers as the circles around the conductor. So, if it is viewed from the above plane this field lines will be clockwise circles, but the direction of the magnetic field at any point on this circular magnetic line is in the direction of the tangent drawn to the circular magnetic lines at the desired points.