1/7/2024 0 Comments Magnetic fluxThis is why we define the magnetic flux density as the force exerted per unit of length for a current of 1 ampere. If we consider a wire of finite length, the formula makes sense, whereas it does not make sense for an infinitely long wire. Supposing the magnetic flux density is perfectly perpendicular to the current, the formula for the force exerted is: This also implies that if the current and the magnetic flux density are in the same direction, the current will not suffer any effect at all. The direction of the force exerted is perpendicular to both the field and the current. Source: Tokamac, Wikimedia Commons (CC BY-SA 4.0).Įssentially, the more perpendicular the magnetic flux density is to the current, the more effectively it will affect the wire. Right-hand rule for currents and magnetic fields. To determine the direction in which a magnetic flux density affects a current, we need to use the rule of the right hand, shown in the image below.įigure 2. Generation of magnetic flux density with a wireįor our wire, we directly state the formula of the magnetic flux density it creates: In the following, we are going to analyse two different settings, which can be mixed up since wires carrying an electric current can create a magnetic flux density and be affected by electric fields in the same way that electric charges can create an electric field and be affected by other electric fields. Let us consider an infinitely long straight wire carrying a certain electric current with the intensity of I. From now on, it will be useful to consider electric currents as the basic objects of magnetic interactions, just as electric charges are the basic objects for electric interactions. It is a vector field that indicates the direction of the magnetic field acting on a certain region of space. The magnetic flux density is the measure of the strength of the magnetic field. An electrical current is a collective effect achieved by the movement of charges from one point to another. Whenever an electric current is present in our system, it generates a magnetic field.
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