Magnetostatics - The divergence and the curl of B - straight-line currents

3 important questions on Magnetostatics - The divergence and the curl of B - straight-line currents

What is the curl of a B field?

It is nonzero. B decreases at the same rate as the circumference increses and therefore it is independent of s

What is I enc?

It is I enclosed it stands for the total current enclosed by the integration path . If this is represented by a volume current density J: we would have the following;

What is a limitation of the following formula?

It has the restriction to infinite straight line currents Most current configurations cannot be constructed out of infinite straight wires.

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