If the electric field is uniform, the electric flux passing through a surface of vector area S is. where E is the electric field (having units of V/m), E is its magnitude, S is the area of the surface, and θ is the angle between the electric field lines and the normal (perpendicular) to S.
Why is flux cos theta?
You use cos θ because you want the component of the field in the direction of the surface normal. Whenever you need a component of a vector in a certain direction, you multiply the magnitude of the vector by the cosine of the angle it makes with that direction.
What is the angle in the flux equation?
Electric flux = Electric field * Area * (angle between the planar area and the electric flux) The equation is: Φ = E A cos(θ)
What is Q in electric flux?
Q. α Φ Thus the net flux through a closed surface surrounding a net charge is a qualitative measure of the net charge inside a closed surface. This can be demonstrated by the following figures: Page 5 5 (1) The net flux across surface is +Φ because electric field lines are leaving surface.
What is N in electric flux?
Examples include spherical and cylindrical symmetry. Electric flux has SI units of volt metres (V m), or, equivalently, newton metres squared per coulomb (N m2 C−1).
Is Tesla a SI unit?
The tesla (symbol T) is the derived SI unit of magnetic flux density, which represents the strength of a magnetic field. One tesla represents one weber per square meter.
How do you find Theta in magnetic flux?
ΦB=B⋅A=BAcosθ Φ B = B ⋅ A = BA cos , where B is the magnitude of the magnetic field (having the unit of Tesla, T), A is the area of the surface, and θ is the angle between the magnetic field lines and the normal (perpendicular) to A.
How do you find the angle of an electric flux?
The electric flux Φe of a uniform electric field E through a loop of area A is defined as Φe = E A cosθ where θ is the angle between the field lines and the normal vector, n, to the plane of the loop.
At what angle electric flux is maximum?
Therefore flux will be the maximum if the angle is 0 degrees.
At what angle is flux zero and maximum?
Now if E is perpendicular to the surface then two vector will be parallel so angle between them will be zero and cos 0 =1 so the flux will be maximum.
What is Q Enclosed formula?
q (coulombs enclosed) = D x 4 r2. The lines of flux contributing to the flux density are those that leave the sphere perpendicular to the surface of the sphere.
What is electric flux density?
Scientific definitions for electric flux density
electric flux density. A measure of the strength of an electric field generated by a free electric charge, corresponding to the number of electric lines of force passing through a given area.
Can flux be negative?
The negative flux just equals in magnitude the positive flux, so that the net, or total, electric flux is zero. … 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.
What is magnetic field flux?
Magnetic flux is a measurement of the total magnetic field which passes through a given area. … If we use the field-line picture of a magnetic field then every field line passing through the given area contributes some magnetic flux. The angle at which the field line intersects the area is also important.
What does negative flux mean?
Remember our convention for flux orientation: positive means flux is leaving, negative means flux is entering. In this example, water is falling downward, or entering the tube. This means the top surface has negative flux (it appears to be siphoning up water).
What is E in Gauss law?
Gauss’s law may be expressed as: where ΦE is the electric flux through a closed surface S enclosing any volume V, Q is the total charge enclosed within V, and ε is the electric constant.