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Magnetic Field Due to a Straight Current Carrying Conductor

In a coaxial ...

Question

In a coaxial straight cable, the central conductor and the outer conductor carry equal currents in opposite directions. The magnetic field is zero
a) outside the cable
b) inside the inner conductor
c) inside the outer conductor
d) in between the two conductors
Pl. give reason.

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Solution

a) Outside the cable
This is because the magnetic fields produced by the two wires would be in opposite directions and will cancel each other out.

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