In a co-axial straight cable, the central conductor and the outer conductor carry equal currents in opposite directions. The magnetic field is zero

Question

In a co-axial straight cable, the central conductor and the outer conductor carry equal currents in opposite directions. The magnetic field is zero [2024]

Smart Achievers · Accepted Answer

(1)

$\oint \vec{B} \cdot d \vec{ℓ} = μ_{0} i_{enc} = 0 ∴ B = 0 outside the cable$

Solution

Q.
In a co-axial straight cable, the central conductor and the outer conductor carry equal currents in opposite directions. The magnetic field is zero [2024]

1 outside the cable

2 in between the two conductors

3 inside the inner conductor

4 inside the outer conductor

Ans.
(1)

$\oint \vec{B} \cdot d \vec{ℓ} = μ_{0} i_{enc} = 0 ∴ B = 0 outside the cable$

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