Question:medium
A long straight wire is held vertically and carries a steady current in upward direction. The shape of magnetic field lines produced by the current-carrying wire are :
A long straight wire is held vertically and carries a steady current in upward direction. The shape of magnetic field lines produced by the current-carrying wire are :
Updated On: Feb 9, 2026
- horizontal straight lines directed radially out from the wire.
- straight lines parallel to the current-carrying wire.
- concentric horizontal circles around the wire.
- coaxial helixes around the wire.
Show Solution
The Correct Option is C
Solution and Explanation
A steady current in a long straight wire generates magnetic field lines in concentric circles around it, a principle described by Ampere’s Law. The direction of these magnetic field lines is determined by the right-hand rule: pointing your right thumb in the direction of the current, your curled fingers indicate the direction of the magnetic field.
\r\rConsequently, a vertical current-carrying wire produces horizontal magnetic field lines arranged in concentric circles around the wire.
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