A coaxial cable consists of a thin inner conductor fixed along the axis of a hollow outer conductor. The two conductors carry equal currents in opposite directions. Let 
and 
be the magnetic fields in the region between the conductors, and outside the conductor, respectively:
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
Apply ampere’s circuital law to the coaxial circular loops 
and 
. The magnetic field is 
at all points on 
and 
at all points on 
for 
and 
for 
Hence 
but 
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