Plot a magnetic field due to a circular ...

Plot a magnetic field due to a circular coil carrying current and explain the law used to find the direction of magnetic field at the centre of circular coil carrying current.

Text Solution

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The magnetic lines of force due to circular coil carrying current are perpendicular to the wire loop and are circular near the wire and practically straight near the centre of the wire loop figuer

The direction of magnetic field at the centre of circular current loop is given by Right hand rule. For it refer to Art

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The magnetic moment of a circular coil carrying current is

Directly proportional to the length of the wire in the coil

Inversely proportional to the length of the wire in the coil

Directly proportional to the square of the length of the wire in the coil

Inversely proportional to the square of the length of the wire in the coil

The magnetic field at the centre of current carrying coil is

`(mu_(0)ni)/(2r)`

`(mu_(0))/(2pi)(ni)/r`

`(mu_(0)ni)/(4r)`

`mu_(0)ni`

The direction of magnetic moment of a current carrying circular coil is

along the circumference, in clockwise direction.

along the axis, perpendicular to the plane.

along anticlockwise direction.

along the equator in straight line. The circumference.