Published by:
CGP EDU Academic Team
Published on: September 12, 2026
A long straight wire with a circular cross-section having radius R, is carrying a steady current I. The current I is uniformly distributed across this cross-section. Then the variation of magnetic field due to current I with distance r (r < R) from its center will be
A
B 
r 2
r 2
B
B 
r
r
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Use Ampere s law
Thus 
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