Electrical Fields
The electric field lines due to a point-like negative charge point...
radially inward
if the integral of EdS = 0 inside a surface, this means that the net charge is
zero
What is the S.I. unit of electric flux?
Nm2/C
What is the surface area of a sphere?
4*Pi*r2
For an infinite sheet of charge, the electric field is ________ to the surface.
perpendicular
The electric field lines due to a point-like positive charge point...
radially outward
A charge is enclosed by a sphere of radius R. If the radius increases to 2R, the electric flux will:
remain the same
Which is the correct expression of electric flux?
a) β« πΈβ .ππ β
b) β« πΈ2β.ππ β
c) β« πΈβ β1.ππ β
d) β« πΈβ .ππβ
a) β« πΈβ .ππ β
What is the total surface area of a cylinder?
(2*Pi*r*h) + (2*Pi*r2)
The electric field is perpendicular to the sheets, thus the flux through the curved sides of the cylinder is zero.
The force on a particle between two infinitely large plates of charge +Q and -Q is
(a) constant
(b) not constant
constant
In Gauss' Law, the net electric flux through a surface is equal to the charge inside of the surface divided by:
Ξ΅0
A charge q is in the centre of a cube. The electric flux through any face of the cube is:
q/[6*Ι0]
A sphere of radius 100cm has a charge of 2*Pi/3 uC. The surface density of charge is: (answer in C/m^2)
1.67*10-7 C/m2
(or 16.67 uC/m)
What is the acceleration on a particle of charge q and mass m in the region between two charged sheets with an electric charge E?
a=qE/m
The maximum electric flux on a 48.5cm diameter circular loop in an uniform electric field is found to be 5.93*105 Nm2/C. What is the magnitude of the electric field?
3.21*106 N/C
If the net flux on a cylinder is negative, will there be more electric field lines exiting or entering the surface?
More lines entering
The maximum value of electric flux in an uniform electric field is given as:
Ξ¦=|E|*|A|
Two charges q and 10q are placed inside two identical spheres. Which sphere will have the greatest flux?
The electric field intensity due to an infinitely charged sheet is
Ο/2Ι0
Two small charged spheres have charges 10uC and 40uC. They are 90cm away from each other. At what distance from the sphere with charge 10uC will the electric field intensity be zero?
30cm
A cube has a net flux of 3.75 Nm2/C. The length of a side of the cube is 0.5m. What is the net charge (in C) inside of the cube?
3.32*10-11 C
A square surface with sides d=5cm has a uniform electric field E=350N/C at an angle of 60 degrees to the normal of the surface. What is the electric flux through the surface?
0.4375 Nm2/C
If we considered an infinite cylinder of uniform charge density causing electric field E using a Gaussian surface in the form of a cylinder of length L (with radius larger than the infinite cylinder), what would the electric flux be equal to in this situation?
E*2*Pi*r*L
Two infinite sheets of charge are parallel to one another, one positive and one negative. The electric field outside these plates is:
zero