A long straight wire of radius a carries 
steady current 
. The current is uniformly distributed over its cross‐section. The ratio of the magnetic fields 
and 
, at radial distances 
and 
respectively, from the axis of the wire is
A
1
B
4
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Magnetic field at a point inside the wire at distance 
from the axis of wire is
Magnetic field at a point outside the wire at distance 
from the axis of wire is
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