The flow of current in a circular wire creates a magnetic field at its centre


#1

The flow of current in a circular wire creates a magnetic field at its centre. How can existence of this field be detected? State the rule which helps to predict the direction of magnetic field.


#2

The existence of this field can be detected by using a magnetic compass needle. The direction of magnetic field is predicted by using Maxwell’s right hand thumb rule.
It states that if you hold a current-carrying conductor in right hand, such that the thumb points in the direction of electric current, then the direction in which fingers encircle, gives the direction of magnetic field.