Therefore electric flux will be a 1 Volt Meter. If an electric field crosses with an angle of \(60^\) to it and has E= 2 Volte per meter. Electric flux is a scalar quantity and has an SI unit of newton-meters squared per coulomb ((N cdot m2/C)). Then you can use Gauss law to find the electric flux. The total of the electric flux out of a closed surface is equal to the charge enclosed divided by the permittivity. Now theres some units associated with electric flux, you might not need to know them, but you can always get them back from the electric fields in the areas and things like that. Q.1: A planar surface has an area of 1 square meter. Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. And if you have all those three things together, then the electric flux has an equation. The angle between the plane and the axis parallel to the direction of flow of the electric field. ![]() Similar to the above example, if the plane is normal to the flow of the electric field, the total flux is given as:Īlso, if the same plane is inclined at an angle \theta, the projected area can be given as \(Acos\theta\) and the total flux through this surface will be, The total number of electric field lines passing through a given area in a unit time is the electric flux. positive if it is positive, negative if it is negative. If a net charge is contained within a closed surface, then the total flux through the surface will be proportional to the enclosed charge, i.e. So, the net or total, the electric flux will be zero. The negative flux is just equal to the magnitude of the positive flux. If there is no given net charge within some closed surface then every field line directed into the given surface will continue through the interior. Therefore it is analogous to the flow of liquid as discussed above. The electric field is behaving in a similar way. Here, \(dA cos\theta\) is the projected area of the plane towards the perpendicular direction of the flow of the liquid. Then the total volume of liquid crossing through the plane per unit time is given as \(v ×dA \ cos \theta\). When the plane is not exactly normal to the flow of the fluid then it will be inclined at an angle \(\theta\). ![]() Department of Physics and Applied Physics. Then the volumetric flow of the liquid crossing that plane normal to the flow will be given as v × dA. Before defining the electric flux, we need to introduce the area vector. Let us consider a small unit area of the plane given as dA. ![]() We will take the cross-sectional plane of the pipe. 2 Solved Examples Electric Flux formula What is electric Flux?Ĭonsider the flow of water with some velocity v in a pipe in a certain fixed direction, suppose towards the right.
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