Linked Questions

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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
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2answers
527 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
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1answer
110 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 field ...
0
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2answers
164 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
52 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
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0answers
25 views

What exactly is electric flux? [duplicate]

I have seen plenty of definitions and descriptions of electric flux. Most of them say it is the number of field lines per unit area. However how can there be a fixed number of field lines in a unit ...
0
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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
1answer
18 views

Electromagnetic field lines [duplicate]

Okay so this is a pretty famous statement made to anyone who is introduced to the magnetic effects of electric current a.k.a. electromagnetism: The relative strength of the magnetic field is shown by ...
0
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5answers
6k 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? ...
4
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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 ...
-1
votes
3answers
752 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
182 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
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1answer
1k 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
380 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
646 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 ...
0
votes
3answers
335 views

How does electric flux represent the number of electric field lines passing through a given area?

As far as I understand, electric field lines are only a way to "visualise" electric field. There is no specific rule for the number of field lines to be drawn for a particular field. If it is so, then ...
1
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3answers
82 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 $B$ ...
2
votes
4answers
121 views

Electric field line density : Theory vs Reality

I've already went through this post. Yet, I still can't understand the meaning of "density" of electric field lines whose number is, in reality, infinite. One of the answers , for instance, states ...
-1
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3answers
92 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 ...
0
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2answers
191 views

Electric field lines properties

I wanted to ask a question. My question is that are the properties of field lines ( number of field lines leaving/entering a point charge is proportional to the charge, field strength between points ...
1
vote
2answers
104 views

Uniform electric field lines

in the case of uniform electric field why should electric field lines be equally spaced? Is this related to advanced math stuff?
-3
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3answers
86 views

Eight field lines for a point charge - why?

When you have a point charge, q, eight field lines are drawn to represent this element of charge - Why eight? Is this something just selected as a standard because electric field lines are infinite ...
0
votes
1answer
105 views

How electric field lines are defined?

I am having confusion understanding that how for finitely many fields lines in the space, the intensity of a field is proportional to the number of field lines passing through a surface area? Also, ...
0
votes
2answers
39 views

Field strength at point using field lines

I have recently read that the electric field strength can be compared between 2 points from the relative field line density but I am having trouble in applying the concept. What I find confusing is ...