A circular loop carrying current I lies in the yz plane with its axis along the x axis. (a) Evaluate the line integral ?C B ?c dl along the axis of the loop from x = l1 to x = +l1. (b) Show that when l1 ? 8, the line integral approaches æ0I. This result can be related to Amperes law by closing the curve of integration with a semicircle of radius l on which B ? 0 for l very large.
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