#Magnetic fieldlines free#

#Magnetic fieldlines free#

If at any point on such a line we place an ideal compass needle, free to turn in any direction (unlike the usual compass needle, which stays horizontal-such needles exist, see bottom of page) then the needle will always point along the field line (drawing below).įield lines converge where the magnetic force is strong, and spread out where it is weak. Magnetic field lines similarly describe the structure of magnetic fields in three dimensions.They are defined as follows. When researchers map the three-dimensional flow of a river around a bridge pier, or of wind around the wing of an airplane (picture below), they use streamlines, lines that trace the flow of particles of water or air. Magnetic Field Lines - History (Files in red–history) The direction of this magnetic field is given by Right Hand Thumb Rule.#5H. Oğrom this we see that the current carrying conductor produces a magnetic field around it. O The magnetic field produced by a current-carrying straight wire depends inversely on the distance from it and directly on the current passing through it. O We can see that the magnetic field in both cases is in opposite directions as is the current. O When current flows through the conductor, the iron filing arrange themselves along the magnetic field. O There are some iron fillings sprinkled on the conductor. In both cases, the current carrying conductor is intercepted by a cardboard placed at right angles to the current carrying conductor. O In the above figures, note that there are current carrying conductors in opposite directions. The direction of magnetic field lines gets reversed if the direction of current is reversed. The field increases as object O is closer to the conductor and decreases as it moves away from the conductor.ĥ. The magnetic field (B) acting on the object O increases as the current flowing through it increases.Ĥ. The direction of the field is perpendicular to the conductor.ģ. These lines do not intersect each other and are equidistant from each other.Ģ. You will observe that the magnetic field lines are formed in concentric circles around the current carrying conductor. This is known as right hand thumb rule.Ī battery (12 V), a variable resistance (or a rheostat), an ammeter (0–5 A), a plug key, and a long straight thick copper wire. Then your fingers will wrap around the conductor in the direction of the field lines of the magnetic field (See Fig.1). Imagine that you are holding a current-carrying straight conductor in your right hand such that the thumb points towards the direction of current. The direction of the magnetic field lines of force around a conductor is given by the Maxwell’s right hand grip rule or the right handed corkscrew rule. The strength of the magnetic field created depends on the current through the conductor.ĥ. The nature of the magnetic field lines around a straight current carrying conductor is concentric circles with centre at the axis of the conductor.Ĥ. Magnetic effect of electric current is one of the major effects of electric current in use, without the applications of which we cannot have motors in the existing world.Ģ.Ě current carrying conductor creates a magnetic field around it, which can be comprehended by using magnetic lines of force or magnetic field lines.ģ. To observe the magnetic field lines around current carrying conductor.