[L1] Electric Flux

flux

a continuous moving on or passing by or a continued flow

N/C (force/unit charge)

units for electric field

m²

unit for area in electric flux

e*a*cos(o)

formula for electric flux

electric flux

this is a measure of the “flow” of electric field through a surface

flow

electric flux is a measure of the “____” of electric field through a surface

electric flux (fluxE)

it is equal to the product of an area element and the perpendicular component of electric field, integrated over a surface

area element, perpendicular component of electric field

electric flux is equal to the product of an ____ and the ____, integrated over a surface

9×10^9 nm²/c²

charge for coulomb’s constant

1.6×10^-19 C

charge of one electron

Nm²/C

unit for electric flux

EA

for a uniform electric field on a flat surface (normal of surface is parallel to direction of electric field), the formula for flux is

electric flux

the electric flux is proportional to the number of electric field lines penetrating some surface

electric field lines

the electric flux is proportional to the number of ____ penetrating some surface

EAcos(o)

the field lines may make some angle with the perpendicular surface. because of this, flux formula becomes?

normal is parallel to electric field (E and A are parallel)

when is there maximum electric flux

normal is perpendicular to electric field (E and A are perpendicular)

when is there minimum or no electric flux

scalar product of electric field and the area vector

electric flux through the surface equals the ____

perpendicular

flux is maximum when the surface is ____ to the field

parallel

flux is zero when the surface is ____ to the field

test charge

using this allows you to probe the amount of charge inside the box without opening it

negative

after using a test charge, if the flux is inward, this means that the charge inside the box is

positive

after using a test charge, if the flux is outward, this means that the charge inside the box is

outward

positive charge inside the box goes with ____ electric flux through the box’s surface

inward

negative charge inside the box goes with ____ electric flux through the box’s surface

no charge inside the box, zero net charge inside box (both positive and negative charge inside and the fluxes cancel out), uniformly charged sheet outside the box produces both fluxes flowing through the box, both cancelling each other out

three cases where there is no flux through the box surface

outside

charges ____ the surface do not give a net electric flux through the surface

net amount of charge enclosed within the surface, the size of the enclosed surface

the net electric flux is directly proportional to the ____, but it is otherwise dependent of ____