Linked Questions

1
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3answers
1k views

How can flux be the number of electric field lines normal to a surface? [duplicate]

Shouldn't the number of field lines through any surface be infinite if there is a charge present. Or is there a finite number of field lines from a unit charge?
1
vote
2answers
500 views

Understanding field representation of force [duplicate]

I am reading the book The Evolution of Physics. I have a doubt in the topic "The field as representation". In this topic authors give the example of gravitational force represented as a field. In the ...
-2
votes
1answer
89 views

Some doubts about Field Lines [duplicate]

Take electric field lines as example. In EM textbooks it is stated that The tangent of a field line gives the direction of the electric field The density of field lines is proportional to the ...
0
votes
2answers
62 views

Electrostatic field-Field lines relationship [duplicate]

How is the $\frac{1}{r^2}$ dependence of the electric field intensity due to a stationary point charge consistent with the concept of field lines?
-1
votes
1answer
38 views

Electric flux and electric field lines [duplicate]

Why we draw finite electric field lines passing through a surface when we can draw infinite ? also why electric flux is proportional to the number of lines passing through a surface ? i am confused ...
0
votes
0answers
22 views

How does one start drawing electric fields? [duplicate]

How does one start drawing electric fields.you are given two charge.now there are infinite electric field lines so how do you show greater electric field by drawing denser lines.After all there can be ...
0
votes
5answers
5k views

Direction of the electric field of a negative point charge?

How can the direction of the electric field of a negative point charge be going in towards itself (radially), when the charge itself is generating the electric field? Is it generated at infinity then? ...
3
votes
1answer
2k views

Definition of a field line?

Ok so I finished by A-levels last year (english exams 18 year olds take) and we defined in my physics course we defined field lines (for an electric field) as: The path a free positive test charge ...
-2
votes
3answers
589 views

Is the electric dipole moment a mathematical construct or does it have a counterpart in reality?

I've been looking on the net for electric point dipoles but couldn't find something useful (at least to me). The strange thing about an electric point dipole (the dipole moment pointing to the right ...
6
votes
2answers
158 views

Significance of electrical fields of infinite objects

I've noticed a pattern with the electric fields of charged objects of infinite dimensions. A point charge, which can be considered a charge of 0 dimensions, has an electric field that goes as $r^{-2}$...
1
vote
1answer
545 views

Electric field lines visualized - uneven distribution - correct or incorrect?

I have rendered an image, where two positive charges with equal electrical charges are present: I was told that the picture is not correct, because the field lines are getting "concentrated", so if I ...
0
votes
2answers
247 views

Will electric field lines begin or end at a point other than a charge? Feynman Lectures Vol II Chapter 1

In The Feynman Lectures on Physics Vol. II Ch. 1: Electromagnetism, the following is stated: There have been various inventions to help the mind visualize the behavior of fields. The most correct ...
0
votes
1answer
377 views

I'm confused about what streamlines are in electromagnetism

In the below picture, what exactly is the streamline? Is it the three blue curves or is it the E vector drawn? Also, to calculate the equation of the streamline, we are using the ratio of the ...
1
vote
3answers
79 views

What happens to the $E$ and $B$ fields at the edge of a laser beam?

In an ideal plane wave, $E$ and $B$ fields run off to infinity in both directions along straight paths. I've always assumed the center of a laser beam looks like an ideal plane wave, with $E$ and $B$ ...
-1
votes
3answers
79 views

Why is the flux no infinite around an isolated charge?

I was wondering that the density of electric field lines determine the strength of the electric field .Now let's say you have an isolated charge ; you know the flux through a closed surface which I ...

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