Published by:
CGP EDU Academic Team
Published on: September 12, 2026
Consider a long straight wire of a circular cross-section (radius a) carrying a steady current I. The current is uniformly distributed across this cross-section. The distances from the center of the wire's cross-section at which the magnetic field [inside the wire, outside the wire] is half of the maximum possible magnetic field, anywhere due to the wire, will be
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
Maximum possible magnetic field is at the surface
It can be obtained inside as well as outside the wire For inside,
For outside
Correct answer 
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