There are many processes of finding the direction of the magnetic field. Practically, the direction of the magnetic field is indicated by the compass needle's movement within the magnetic field.Apart from this, there are a few rules that help determine the direction of the magnetic field. One of them is the right-hand thumb rule. It states that if we hold the current-carrying wire in our right hand such that the thumb points toward the direction of the current flow, then the fingers encircling the wire points towards the magnetic field lines’ direction. Maxwell stated the right-hand thumb rule; hence, it is also known as Maxwell's right-hand thumb rule.