Published by:
CGP EDU Academic Team
Published on: August 14, 2026
A long straight cylindrical region of radius 
curries a current along its length. The current density (J) varies from the axis to the edge of the cylindrical region according to 
Where r is distance from the axis 
Which is the correct equation magnetic field for are 
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Current 
Mean current density is 
Current enclosed within distance 
from the axis is
Using ampere's law on a circle of radius r gives
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