Published by:
CGP EDU Academic Team
Published on: August 14, 2026
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
A
Zero in the region 
and inversely proportional to 
in the region 
and inversely proportional to in the region
B
Inversely proportional to 
in the region 
and uniform throughout in the region 
in the region and uniform throughout in the region
C
Directly proportional to 
in the region 
and inversely proportional to 
in the region 
in the region and inversely proportional to in the region
D
Uniform in the region 
and inversely proportional to distance 
from the axis, in the region 
and inversely proportional to distance from the axis, in the region
Text Solution
Verified by ExpertsThe correct answer is:
C
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