Electric charge Definition and 272 Threads

Homework Statement Suppose that the electric field in the Earth's atmosphere is E = 92 N/C, pointing downward. Determine the electric charge in the Earth. Homework Equations The Attempt at a Solution I suppose that I'm supposed to construct a Gaussian around the Earth and find the...

I have a question about transfer of electric charge in metals. My understanding is that electrons move in and out of an object at an equal rate when current is flowing (i.e., net change in # of electrons is zero). At the same time, it is possible for an object to become positively or negatively...

If m mass is complete ly distroy by e=mc2...then what happen about electric charge and magnetic energy?

Homework Statement A metallic sphere A of radius 1.00 cm is several centimetres away from a metallic spherical shell B of radius 2.00 cm. Charge 450 nC is placed on A, with no charge on B or anywhere nearby. Next, the two objects are joined by a long, thin, metallic wire, and finally the...

In the standard model, electric charge isn't fundamental, it's a combination of "hypercharge" and what could be called "W0 boson charge". In quantum field theory, a charge is (from the particle perspective) the quantum probability for emission/absorption of a force particle; or (from the...

Electric charge question[Updating...] 1) I tried to do this homework, but my answer is all , of course it is not as same as this question's answer. That is my procedure: +) First, 2 charged have a same chagre Q, after these also have a same charge q=(Q-Q'). +) F'/F=[(Q-Q')/Q]^2. +) I...

The electric charge is measured in Coulombs. 1 Coulomb is defined as "the charge of approximately 6.241×10^18 electrons" by wikipedia. When I look up the charge of one electron, I get: 1.60217657 × 10^-19 coulombs I'm confused by the fact that electronic charge is defined in terms of...

Hi all, When we rub two stones and get a spark , is there any chance of static charge accumulation or it is just the mechanical energy of friction is transferred in form of heat energy. Thanks in advance. Jayesh.

If an electric charge is placed into an electric field of a charge that has been around for a while, it will start to move until equilibrium is reached, or until it's field has propagated out as far as the other charge. Note that the charges are connected by some non-conductive material...

Is there any explanation about the nature of electric charge? Everyon currently knows that an electric charge has ability to generate force and an electromagnetic field. Also, it has attractive and repulsive reactions to other charged particles. Finally, it is known that electric charges obey...

Homework Statement Two identical conducting spheres, fixed in place, attract each other with an electrostatic force of 0.108 N when their center-to-center separation is 50.0 cm. The spheres are then connected by a thin conducting wire.When the wire is removed, the spheres repel each other with...

What is the mainstream answer? And why is asking if the electric charge is quantized important? What does it mean to have charge that is not quantized?

Hi I'm wondering why does the charge resides on the plates on a capacitor when it's charged but not on say two closely placed wires or circuit traces etc, well I do understand that charges stay on capacitor plates because the opposite charges tend to attract and with a distance between them they...

A galaxy is many many light years away. All Electric Charge, Q, must be dissipated. How do you tell if charge exists and what magnitude.

Homework Statement A) Two electric charges each with the charge of -35 nC is 0.70m apart from each other. With how big of a force do they impact each other? B) A small metallic ball has a positive charge of 25nC. A particle with the charge +2.0nC is affected by a repellent force that's...

Homework Statement Dielectric medium inside capacitor consists of two types (check the pic). Capacitor's plates are connected to a source of constant tension U. Distance between the plates is d and their area is S. Find the electric charge of capacitor's plates. Data given: U=500 V, d=2cm...

Hello, I just started to read up on some basic electromagnetism and have some questions on: 1) Why do the electrons flow from the glass rod to the silk when you rub it? Why the preference for the silk? And if glass is an insulator, how do the electrons 'escape' the atoms their orbits (looking...

If magnetic charges existed, would the strength of the field be the same as a electric charge? Would you be able to plug it into the equation of coulomb's law? If so, what would the constant be? The same?

Hi! An iron plate with a mass of 1 kg surrounded by vacuum has an electric potential of +20 kV. How do I calculate the charge, Q of the iron plate? I have all the information I need, right?

Hello, I just came across this question and no answer could be find, my best assumption is that kitchen foil is simply 'holding' into positveley charged materials? Thanks, JJ

Hi! Someone said me, if I take a plastic straw and wipe it with a handkerchief (or something like that), I can recharge it so that it will hang even on some of the walls due to electric charge (but do not know which way, tomorrow I am going to buy some straws:-D) How would you explain this...

I've been researching this for hours and yet can't seem to get an understanding. So, let's take an electron fixed in space. At any given time it has an electrostatic field around it which decreases with distance and uses photons as a force carrier. It has an elementary charge e- and will...

Homework Statement http://loncapa.vcu.edu/res/vcu/phys202/zzImages/two-charges-forces.bmp Problem#1: Two identical conducting balls, A and B, of identical masses m = 10 kg, are suspended in equilibrium by insulating massless strings in length L = 3 m. Both balls make the same angle θ = 30°...

Why wasn't the electron fixed with the 'positive' value? wouldn't that simplify a lot of issues with electronics problems, i mean, that way things wouldn't have to be all backwards. like, wherever the electrons go is becoming more negative, and whichever direction they are leaving is more...

Homework Statement http://snag.gy/Zg3SO.jpg At the moment is it question A The Attempt at a Solution A) I've realized that Force applied by F_31 + F_41 = F_21 SO I've writte this equation up but Mathmathica, says there is an errror, and gives me an incorrect result...

definition of electric charge as "rationalized charge" Hi All, I wonder about the meaning of the term "rationalized" when saying "rationalized electron charge." Does this mean that the charge is given in natural units? Thank you very much! Best

I am studying for my exam and I have run into this problem. The problem is given here http://faculty.mint.ua.edu/~pleclair/PH253/Homework/Spring_2010/HW6-7_atoms_12Mar10/HW6-7_atoms_12Mar10_SOLN.pdf"],[/PLAIN] it is #9. I don't understand why -e ≠ ∫ρdV from 0 to the bohr radius, a0. If all...

Homework Statement Two tiny spheres of mass = 6.60mg carry charges of equal magnitude, 72.0nC , but opposite sign. They are tied to the same ceiling hook by light strings of length 0.530m . When a horizontal uniform electric field that is directed to the left is turned on, the spheres...

Hard to find a suitable title, but I have a simple question about electric charce and how a generator is affected by how high up one of the charged plates are: If I want to charge two plates with +/- 100kV, then electrons are forced from one plate to the other, so one plate is positive, and...

What is the theoretical highest electric charge possible for an object wihout breaking it? What about charging a piece of PVC to trillions of volt, or trillions times that, or even more. Is it a limit how high the charge can be? Vidar

Hi, If I have two sheets which is highly electric charged, and with the same polarity of 100kV with respect to ground. The sheets are 10cm^2, aligned in parallell surface to surface, and 1cm apart. Now there is a repulsion force between them. Let me say there is a transformer which is...

How do we measure the amount of charge body has. Can you tell me some instruments and how do they work. Well i know how ampere is defined so one coloumb will be the current that flows in one second - but how can wemeasure that?

Homework Statement A positively charged ball is brought close to a neutral isolated conductor. The conductor is then grounded while the ball is kept close. Is the conductor charged positively, negative or neutral, if (a) the ball is first taken away and then the ground connection is removed...

can there be a particle with baryon number +1 and electric charge -2 ?

Homework Statement An electric dipole is situated at the origin and points along z. An electric charge is released from rest at a point in the (x,y) plane. Show that it swings back and forth in a semicircular arc about the origin. Homework Equations Electric field of a dipole (coord...

What symmetry of nature yields the conservation of electric charge?

If you search electric charge on the German Wikipedia (search electric charge on Wikipedia and click on the "Deutsch" blue link on the left side) its dimension is defined as "M^(1/2)*L^(3/2)*T^(-1)". I always thought of electric charge as fundamental property that by definition has its own...

Electric Charge Questions, Please help! Homework Statement I have three problems. I am absolutely desperate for answers. I cannot figure out what to do from the examples my book gives. It doesn't give examples in the book that relate to these problems, and I simply do not know what to do...

I have to say a lot of the physics discussd in this section is a little beyond me but that does not stop me thinking. Given the search for the Higgs Boson which allows mass to exist it has occurred to me what is the origin of the electric charge. Surely as mass is property with an origin what...

I have a question concerning the notion of electric charge in QFT. What value of charge for electron should I use if I want to compute the force acting on electron in some external electric field. Of course in first approximation it is just elementary charge which value might be found in...

Please teach me this: How do we know the generator of U(1) symmetry is the operator of electric charge.Is this observation(the value defined by the operator) being the reserved observation deducing from Noether theorem(considering U(1) symmetry).And also how we know this Noether reserved...

Hi In GSW theory we start with two fermions f f' (charge 0 -1) and 3 bosons w1 w2 w3. the charge of the bosons in only introduced when one mix w1 and w2 giving w+ and w-. Does it mean that before symmetry breaking f and f' were exchanging w+/w- but not the basic w1 w2 w3?

If you sport some X-mas grade wool socks in the typical striding motion across a carpet floor... what causes that build up of charge to stay in the body and leave in such a (seemingly) similar fashion to lightning dispersing into the ground when it doesn't just "wind down"? My best guess has to...

Homework Statement There are two identical, positively charged conducting spheres fixed in space. The spheres are 38.2 cm apart (center to center) and repel each other with an electrostatic force of F1= 0.0615N. Then, a thin conduction wire connects the spheres, redistributing the charge on...

What would happen if all photons had (slight) electric charge? Would we just not be able to see? Or would we not exist at all? Why? If they were negatively charged, would they repel electrons and attracts to the nucleus of an atom? What consequence would this have?

Homework Statement This picture shows two points charges, q1 = +5 nC, and q2 (unknown), fixed in place on the x axis. At the location marked P, the net electric field due to both charges is zero: EP = 0 N/C. Based on the information shown in the picture, what can you conclude about the...

Homework Statement In a region of two-dimensional space, there are three fixed charges: +1 mC at (0, 0), −2 mC at (15 mm, -2 mm), and +3 mC at (-5 mm, 15 mm). What is the net force on the −2-mC charge? ? magnitude ? direction ° counter-clockwise from...

"Electric charge is a theoretical given . . ." Hi, folks. First, I'd like to say that although I plan to major in physics next semester, I know very little of it now. My lack of posts doesn't reflect how often I frequent this forum, though. While browsing a thread asking what "charge" is, I...

I recently learned about r-c circuits and was wonderring that if Earth can provide electrons then why is it not used as a source of charge? Will the below circuit be successful in drawing charge? .......... __________ (Isolated Positively Charged...

For SU(2) the three represented gauge fields are A_\mu^1, A_\mu^2 and A_\mu^3 and for U(1) the gauge field is B_\mu. The A_\mu^3 and B_\mu are electrically neutral. The photon \gamma and Z particle are combinations of these. My interest is the dimensions of the following parameters...