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Magnetic Field Due to a Straight Long Wire

A steady elec...

Question

A steady electric current is flowing through a cylindrical conductor.

A

The magnetic field in the vicinity of the conductor is zero

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B

The electric field in the vicinity of the conductor is non-zero

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C

The magnetic field at the axis of the conductor is zero

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D

The electric field at the axis of the conductor is zero

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Solution

The correct option is C The magnetic field at the axis of the conductor is zero
As Binside=μ02Ir4πR2
at the axis of the conductor r=0
∴Binside=0

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Q. A steady electric current is flowing through a cylindrical conductor.
(a) The electric field at the axis of the conductor is zero.
(b) The magnetic field at the axis of the conductor is zero.
(c) The electric field in the vicinity of the conductor is zero.
(d) The magnetic field in the vicinity of the conductor is zero.

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