Question

state the rule which gives the direction of magnetic field associated with a current carrying conductor.

Answer 1

The Right-hand thumb rule is a convenient way of finding out magnetic field assosciated with a current carrying conductor.

Answer 2

The right-hand thumb rule:if the current carrying conductor is imagined to be held in your right hand such that the thumb indicates the direction of the current,then the direction of the wrapped fingers gives along the direction of magnetic field of the conductor.