Neutral Definition and 338 Threads

Hi People all know that a neutral atom has no net charge. Well, does that mean that it neither creates an electric field nor is affected by any electric field? I wonder whether it's correct or not, because the distance between a test charge outside this atom is closer to its electrons...

Probably there's a simple answer for the following question. What prevents a neutral particle falling into a black hole from beyond the event horizon - a point it would have to have an escape velocity greater than the speed of light to reach from the inside - from being accelerated past the...

Homework Statement Explain the advantages of using hollow cross sections against solid sections in beam bending applications. Homework Equations None The Attempt at a Solution I know this has something to do with the Neutral axis and the second moment of area for the beam but i...

How does rubbing separate positive and negative charge on neutral objects?

I understand that K_l = \frac{d\bar{s} + s\bar{d}}{\sqrt{2}} K_s = \frac{d\bar{s} - s\bar{d}}{\sqrt{2}} This happens because K_0 is oscillating into its own antiparticle. My question is, why the same is not applicable to the neutrinos? They do oscillate. So instead of ‘pure’ e, mu, tau...

Sphere A corries a net positive charge, and sphere B is nuetral. They are placed near each other on an insulated table. Sphere B is briefly touched with a wire that is grounded. What would happen to the neutral sphere? I know it woul become a neg charged but i don't know what happens when its...

Why is it not allowed for the neutral pion to decay to three photons? The PDG states that this mode violates charge conjugation, although obviously the two photon decay is the dominant decay of this particle, and I don't see how adding another neutral particle to the decay causes a violation of...

This is a theoretical question about completing a circuit and trying to understand what a main panel ground rod does. The question is: Could you run just one hot wire (not in a conduit, but in free air) without an accompanying neutral to the lug of the bus bar in a main panel. The neutral...

This is a question that I'm doing as part of revision for my January mocks. Being bad a algebra in general, I'm stuck. The answer is a worked example and I still don't understand it, so I'm feeling very silly. Homework Statement Charges of +4C and +8C are placed 1.00m apart. At what...

I understand that an electron spin is intrinsic. We call it spin because electron has a magnetic moment, which would be naturally produced if the electron is physically spinning. All we know is that for whatever reason, electron has a magnetic moment. My question is, how do we know if neutral...

1.A cloud of neutral hydrogen is moving towards us at a speed of 70 kilometers per second. At what wavelength would one observe the radio spectral line characteristic of neutral hydrogen? 2. The filament in a regular incandescent light bulb reaches a temperature of 2900 k when it's on. a...

Homework Statement Predict if the following salts are acidic, basic, neutral or undetermined. Homework Equations a. NaOCl b. NH4I c. Sr(ClO3)2 d. KCN The Attempt at a Solution A. NaClO = Na+ and ClO- So, if Na+ gives up a proton, that would turn it into Na... and...

Hi to all, hope you can help me with a problem that took me almost all the week Homework Statement To find The Pka of Neutral Red, i had to use this expression \frac{A-A_{HNR}}{A_{NR}-A} So Now I Have to show that \frac{[NR]}{[HNR^{+}]}=\frac{A-A_{HNR}}{A_{NR}-A} i tried backwards and i did...

If SUSY is a candidate theory of nature, it must not allow for Flavor changing neutral current in disagreement with observation. Is there a viable mechanism in low-energy EW-stabilizing broken SUSY that prohibits Flavor changing neutral current?

I have learned from some source that there is a device called neutral compensator .Iwould like to know about it in detail.

Does it correspond with the centroid of the transformed section? For example, if a wood beam had a steel plate fixed along the bottom, would the neutral axis be lower than that of a pure wood beam of similar cross section? Any links showing example probs would be nice too. Sorry that this is...

hi there need help i just need to know why ground and neutral ( A.C CIRCUITS) short together on the body of machine chassis or panels.i found this in one oil heating unit ,with high wattage of heating element. who ever can reply ,highly appreciated with thanks

I wasn't sure whether this question should go in advanced or introductory physics but I decided to post here since it doesn't involve any complex maths. Homework Statement Part 1 Consider a neutral pion at rest. On the basis of conservation of energy and momentum alone, show that it is...

How can I find the "live" wire (household plug)? After playing with an electrical socket (with caution), I realized there is 120v between the black and ground wires. However, the white is supposed to be "live", black is "neutral", and copper is "ground". Since there is 120v between black and...

Homework Statement Consider an electrically neutral object. If this object is given a net positive charge does its mass increase, decrease or remain the same? Homework Equations The Attempt at a Solution i say that the mass decrease. but i don't know why, can someone please...

what are generator neutral earthing resistances. Are they necessary for small generators? (50 KW 3 phase 120/208v.)

Even if they have kinetic energy, neutral particles don't leave tracks behind. Why is that so? Also, can someone please explain how a cloud chamber works? Thanks!

So I know the neutral pion decays as \pi \rightarrow \gamma\gamma my question is though, what forbids this from being an electromagnetic decay? I know it is not decaying via the strong force as there are no quarks resulting from decay. However, I do not see what forbids this from decaying...

I am having a little confusion about the difference between neutral and ground because certainly one can touch a neutral wire and never get a shock. What is neutral any way is it neutral, 0 volts. Then while handling electronics we only use DC. Now in DC there are 3 things 1.Positive(+) or...

IF a phase touches another phase in a 3 phase AC supply it goes bang due to them being 120 degrees apart and therefore being at different voltages when they touch (this, i understand), so WHY, after passing through an electrical component, can all three phases be joined onto a 0 potential wire...

IF a phase touches another phase in a 3 phase AC supply it goes bang due to them being 120 degrees apart and therefore being at different voltages when they touch (this, i understand), so WHY, after passing through an electrical component, can all three phases be joined onto a 0 potential wire...

Hi, Frankly, I'm new to this forum. So please do guide me if I posted wrongly. I need some help in sizing the neutral wire. For a 3 phase 4 wire system (3Ph + N), what is the recommended size of the neutral conductor. Should it be the same as the phase conductor or should it be 50% of the...

Why the decay of neutral pion to electron positon pair is forbidden?

Hey guys, A picture of the question is attached, I am not seeking answers just an explanation of some theory. Now I understand that point A will be under compression due to the weight, tension due to the bending and shear due to torque produced by the wind point b will be under compression...

Is neutral wire at 0 potential?? Does that mean we can easily touch it??

well, that's the question. They both have the same queark structure. (udd). is it only their different bound states the differentiates them?? thus giving both different masses?

I have a parallel 69KV and 12KV line that runs parallel to a railroad track. Also, this system has a static on top for the system neutral. We are getting 20 plus volts and 4 amps on each track in an isolated section of track. We have deenergized the 12 kv and the volts and amps went away. The...

Metal and wood common temperature for neutral "feel" Homework Statement Taken from the homework: At what common temperature will a block of wood and a block of metal both feel neither hot nor cold to the touch. Homework Equations I believe it is just conceptual, so I do not know if one...

Hi all,I discussed this question yesterday but didn't get a satisfactory answer.Why do no charge flows when the +ve terminal of one battery is connected to the -ve terminal of another battery.Please don't just say that my circuit is incomplete or open.In textbooks i read when two bodies placed a...

Hi,It may looks illogical but concepts of electrostatics and current electricity force me to think so..'Are the terminals of a well-charged battery neutral?'my dc fan doesn't work when one of its wire is connected to the positive terminal of one battery and the other wire of the same fan to the...

Homework Statement I'm working on a homework problem which requires me to roughly sketch electric field lines. The object on the left is neutral and grounded, the object on the right was just struck by lightning (and therefore very negatively charged) and I assume that the neutral object in...

If charge radiates on acceleration,what would happen if we accelerate a neutral atom..will this radiate or not? this neutral atom also has electrons and protons which are charged so they should radiate but as a whole this neutral atom should not radiate?both are contradictory.. is this...

Homework Statement The average density of the body of a fish is 1147.0 kg/m3. To keep from sinking, fish have an air bladder filled with air. If the density of air is 1.28 kg/m3, what percentage of a fish's body must be filled with air to be neutrally buoyant? (Note: Enter your percentage...

Homework Statement I'm having difficluty in finding the second moment of area and neutral axis of this beam can anyone help Homework Equations The Attempt at a Solution I know that you have to divide the beam into two rectangles, I have used the formula bd3/12 and Izz, i did Izz...

I have been learning about quarks which is really interesting, but i have become confused when it comes to mesons. I have learned the basics of annhilation, particle and anti-particle, etc, but I have learned that neutral mesons, such as the pi neutral meson are made of a quark, (e.g. up), and...

Hey, I was wondering if anyone knows a bit about financial probability theory. I was wondering when you are pricing options, you take the expectation under Q (a martingale measure). In the case of Black and Scholes, this seems simple as it is unique. When the martingale measure is not unique...

The English language needs a gender-neutral third person pronoun that can refer to people. Without one, we need to find out either the name of a person or his/her gender or something about the person in order to refer to him/her in a sentence. This can be very awkward for several reasons...

If Earth's magnetic field is considered as "B" ,then it has two components along horizontal and vertical.But while determining null or neutral points of a bar magnet only horizontal component of magnetic field is taken into consideration but not vertical component of magnetic field.Why?

I need to determine the quark composition of the neutral antikaon. Below is a copy of my multiple choice question. http://img166.imageshack.us/img166/2025/quarksec1.jpg Here is my attempt at a solution: First, a neutral antikaon is a meson. This means it must be composed of a...

Homework Statement What observation of the process: (anti muon neutrino) + (electron) -> (anti muon neutrino) + (electron) constitutes unambiguous evidence for weak neutral currents, whereas the observation of (anti electron neutrino) + (electron) -> (anti electron neutrino) +...

Hi, I'm trying to achieve neutral buoyancy with a sounding balloon (a large latex balloon). Is there a certain weight/helium ratio that will make it afloat at 10km/20km etc (tyhe balloon bursting altitude is ~38km) One idea that I had was to attach another balloon, which is mostly empty...

Why the neutral wire (the cold) does not cause an electric shock?

Homework Statement At the neutral point the electric field intensity is zero. Two point charges q1=+2nC and q2=-3nC are separated by 2.0m in air. Where is the neutral point?Homework Equations E=f/q coloumbs law E=E[q1] + E[q2] The Attempt at a Solution i don't have a solution for now since i...

Is it allowed? such as a electron neutrino and an electron anti-neutrino. And why? Now, I am confused... Thanks.

What evidence do we have to support the assertion that the universe is electrically neutral on large scales? I know that gravity is the dominant force on large scales but what kind of evidence can we give to support the above statement? Does it suffice to say that we have the same number of...