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A long straight wire, of circular cross ...

A long straight wire, of circular cross section (radius =a) carries a current I which is uniformaly distributed across the cross section of the wire. Use Amphere 's circular law to calculate the magnetic field B(r) , due to wire, at a point distant `r lt a` and `rgta` from its axis. Draw a graph showing the dependence of B(r) on r.

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Apply, Ampere.s circuital law.
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