![]() Question: Consider a uniform electric field E = 3 × 10 3 i ̂ N / C. Notice that the unit of electric flux is a volt-time a meter. In the physics book, the electric flux is defined as the dot product of electric field and the normal vector of a surface then for a surface Phi. I use one book of fundamental physics and another book of electromagnetic engineering the two of them give different equations for electric flux. Solution: The electric flux which is passing through the surface is given by the equation as: I have problem with the equation of electric flux. Find the electric flux that passes through the surface. Question: An electric field of 500 V/m makes an angle of 30.00 with the surface vector. Where the electric field is E, multiplied by the component of area perpendicular to the field. For a non-uniform electric field, usually the electric flux dΦ E through a small surface area dS is denoted by: Where E is the magnitude of the electric field (having units of V/m), S is the area of the surface, and θ is the angle between the electric field lines and the normal (perpendicular) to S. If the electric field is uniform, the electric flux (Φ E) passing through a surface of vector area S is: You can understand this with an equation. Electric flux is proportional to the number of electric field lines going through a virtual surface. In the centimeter-gram-second system, the net flux of an electric field through any closed surface is equal to the consistent 4π times the enclosed charge, measured in electrostatic units (esu). In the related meter-kilogram-second system and the International System of Units (SI) the net flux of an electric field through any closed surface is usually equal to the enclosed charge, in units of coulombs, divided by a constant, called the permittivity of free space. ![]() It is one of the fundamental laws of electromagnetism. The mathematical relation between electric flux and the enclosed charge is known as Gauss law for the electric field. Browse more Topics under Electric Charges And Fieldsĭownload Conductors and Insulators Cheat Sheet PDF If a net charge is contained inside a closed surface, the total flux through the surface is proportional to the enclosed charge, positive if it is positive, negative if it is negative. The negative flux just equals in magnitude the positive flux, so that the net or total, electric flux is zero. ![]() If there is no given net charge within a given closed surface then every field line directed into the given surface continues through the interior and is usually directed outward elsewhere on the surface. Field lines directed into a closed surface are considered negative those directed out of a closed surface are positive. Electric field lines are usually considered to start on positive electric charges and to end on negative charges. It may be thought of as the number of forces that intersect a given area. Electric flux is a property of an electric field. ![]()
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