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

A current loop in a magnetic field

Current loop in a uniform magnetic field

The presence of a magnetic field created by an electromagnet can be detected by a

A current i in a circular loop of radius b produces a magnetic field. At a fixed point fur from the loop on its axis the magnetic field is proportional to which of the following combinations of i and b ?

Magnetic Field || Wire || Loop

A current-carrying straight wire is held in exactly vertical position. If the current passes through this wire in the vertically upward direction, what is the direction of magnetic field produced by it ? Name the rule used to find out the direction of magnetic field.