A long straight wire of circular cross-section (radius a) is carrying steady current I. The current I is uniformly distributed across this cross-section. The magnetic field is

Question

uniform in the region $r < a$ and inversely proportional to distance $r$ from the axis, in the region $r > a$

zero in the region $r < a$ and inversely proportional to $r$ in the region $r > a$

directly proportional to $r$ in the region $r < a$ and inversely proportional to $r$ in the region $r > a$

inversely proportional to $r$ in the region $r < a$ and uniform throughout in the region $r > a$

Solution

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