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
Select the correct option:
A
Zero in the region r < a and inversely proportional to r in the region r > a
B
Inversely proportional to r in the region r < a and uniform throughout in the region r > a
C
Directly proportional to r in the region r < a and inversely proportional to r in the region r > a
D
Uniform in the region r < a and inversely proportional to distance r from the axis, in the region r > a
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