The current density 
inside a long, solid, cylindrical wire of radius 
is in the direction of the central axis, and its magnitude varies linearly with radial distance r from the axis according to 
, where 
. Find the magnitude of the magnetic field (in 
) at 
.
Text Solution
Verified by ExpertsThe correct answer is:
A
Current in the element 
Current enclosed by Amperian loop of radius 
,
Applying Ampere's law
On putting values,
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