Question

how the right hand thumb rule mark the direction of magnetic field around the straight current carrying conductor​

Answer 1

Your thumb should be in the direction of current while the way your fingers are curved show the direction of magnetic field through which you can also find polarity.

Answer 2

Answer:

Right hand rules states that "If the current carrying conductor is held in the right hand by pointing thumb finger towards the direction of current flow and the other fingers curled around the conductor then the curled fingers indicate the direction of the magnetic field due to the current carrying conductor".