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Magnetic field lines around a straight current carrying conductor look like:
straight lines
ellipses
hyperbolas
concentric circles
concentric circles
The magnetic field lines around a straight current-carrying conductor are concentric circles centered on the wire, as given by Maxwell's right-hand thumb rule.
The magnetic field lines around a straight current-carrying conductor are concentric circles centered on the wire, as given by Maxwell's right-hand thumb rule.
Imagine ripples spreading out in concentric circles on the surface of water when you drop a pebble; similarly, magnetic field lines form concentric circular loops centered on the wire carrying the current.
Right Hand Thumb Rule: Thumb = Current, Fingers = Field (circles).
B=2╧Аr╬╝0тАЛIтАЛ тАФ Magnitude of magnetic field at distance r from a long straight conductor
тИоBтЛЕdl=╬╝0тАЛI тАФ Ampere's Circuital Law
When an electric current flows through a straight conductor, it generates a magnetic field in the space around it. According to the Right-Hand Thumb Rule, if you hold the current-carrying wire in your right hand such that your thumb points in the direction of the conventional electric current, then your fingers curl around the wire in the direction of the magnetic field lines, which form concentric circles.
Magnetic field lines around a straight current-carrying wire form concentric circles with the wire at the center.
The plane of these magnetic field lines is perpendicular to the length of the conductor.
The strength of the magnetic field is directly proportional to the current (I) and inversely proportional to the distance (r) from the conductor.
Reversing the direction of current reverses the direction of the magnetic field lines.
Provides a uniform way to visualize electromagnetic induction principles in physics.
Electromagnets and solenoids
Electric motors and generators
Magnetic resonance imaging (MRI) machines
Oersted's experiment first demonstrated the magnetic effect of electric current in 1820.
Option A (straight lines) describes uniform electric fields between parallel plates, not current wire fields.
Option B (ellipses) and Option C (hyperbolas) do not represent the field lines of a straight conductor.
D is correct тАФ Magnetic field lines around a straight current carrying conductor look like concentric circles.
Always remember that for circular loops and solenoids, the field lines inside are straight and parallel, whereas around a straight wire, they are concentric circles.
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