Is it true that the magnetic field lines around a current-carrying straight conductor are concentric lines?

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True

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answer is A.

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Detailed Solution

The above statement is True.
The magnetic field lines around a current-carrying straight conductor are concentric lines.
We know that the magnetic field lines around a current-carrying straight conductor are concentric circles and their centres lie on the wire. So, the electrons moving in atomic orbitals are responsible for the production of magnetic fields. Also, the magnitude of the magnetic field produced by a straight current-carrying wire at a given point is directly proportional to the current passing through the wire. Therefore, it is true that the magnetic field lines around a current-carrying straight conductor are concentric lines.
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