Ampere Circuital Law

A cylindrical conductor of radius is carrying a constant current. The plot of the magnitude of the magnetic field with the distance from the centre of the conductor is correctly represented by the figure:

1.		2.
3.		4.

A thick current-carrying cable of radius ' ' carries current uniformly distributed across its cross-section. The variation of magnetic field due to the cable with the distance ' ' from the axis of the cable is represented by:

1.		2.
3.		4.

From Ampere's circuital law, for a long straight wire of circular cross-section carrying a steady-current, the variation of the magnetic field inside and outside the region of the wire is:

1.	A linearly decreasing function of distance upto the boundary of the wire and then a linearly increasing one for the outside region.
2.	Uniform and remains constant for both regions.
3.	A linearly increasing function of distance upto the boundary of the wire and then a linearly decreasing one for the outside region.
4.	A linearly increasing function of distance upto the boundary of the wire and then decreasing one with dependence for the outside region.