Magnetic field due to currentHard
Question
A coaxial cable is made up of two conductors. The inner conductor is solid and is of radius R1 and the outer conductor is hollow of inner radius R2 and outer radius R3. The space between the conductors is filled with air. The inner and outer conductors are carrying currents of equal magnitudes and in opposite directions. Then the variation of magnetic field with distance from the axis is best plotted as
Options
A.
B.
C.
D.
Solution
For inner cylinder B = 
For air space B =
For outer cylinder B =
For air space B =
For outer cylinder B =
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