A long straight wire of a circular cross-section of radius 'a' carries a steady current I.
Channel: Doubtnut
Date: 2020-08-02

A long straight wire of a circular cross-section of radius 'a' carries a steady current I. The current is uniformly distributed across the cross-section. Apply Ampere's circuital law to calculate the magnetic field at a point at distance 'r' in the region for (i) `rlta` and (ii) `rgta`.