A current i ampere flows along the inner conductor of a coaxial cable and returns along the outer conductor of the cable, then the magnetic induction at any point outside the conductor at a distance r metre from the axis is

Question

A current i ampere flows along the inner conductor of a coaxial cable and returns along the outer conductor of the cable, then the magnetic induction at any point outside the conductor at a distance r metre from the axis is (A)  ∞  (B) Zero (C)  (μ 0/4π )(2i/r)  (D)  (μ 0/4π )(2π i/r)

Tardigrade Admin · Accepted Answer

The described condition can be shown as .The magnetic field at P due to inner and outer conductors are equal and opposite. Hence, the net magnetic field at P will be zero.

Q. A current $i$ ampere flows along the inner conductor of a coaxial cable and returns along the outer conductor of the cable, then the magnetic induction at any point outside the conductor at a distance r metre from the axis is

$\infty$

Zero

$\frac{μ _{0}}{4 π} \frac{2 i}{r}$

$\frac{μ _{0}}{4 π} \frac{2 πi}{r}$

The described condition can be shown as .The magnetic field at P due to inner and outer conductors are equal and opposite. Hence, the net magnetic field at P will be zero.

Q. A current i ampere flows along the inner conductor of a coaxial cable and returns along the outer conductor of the cable, then the magnetic induction at any point outside the conductor at a distance r metre from the axis is

∞

Zero

4πμ0​​r2i​

4πμ0​​r2πi​

The described condition can be shown as .The magnetic field at P due to inner and outer conductors are equal and opposite. Hence, the net magnetic field at P will be zero.

Q. A current $i$ ampere flows along the inner conductor of a coaxial cable and returns along the outer conductor of the cable, then the magnetic induction at any point outside the conductor at a distance r metre from the axis is

$\infty$

$\frac{μ _{0}}{4 π} \frac{2 i}{r}$

$\frac{μ _{0}}{4 π} \frac{2 πi}{r}$