Charged Definition and 1000 Threads

Homework Statement Capacitors C1=13μF and C2=21μF are each charged to 10V, then disconnected from the battery without changing the charge on the capacitor plates. The two capacitors are then connected in parallel, with the positive plate of C1 connected to the negative plate of C2 and vice...

Homework Statement Two parallel plates having charges of equal magnitude but opposite sign are separated by 14.0 cm. Each plate has a surface charge density of 37.0 nC/m2. A proton is released from rest at the positive plate. (a) Determine the magnitude of the electric field between the plates...

Homework Statement This is regarding setting up an integral to calculate the electric field on a point charge that is at a distance "a" from a uniformly charged rod of length "L". I have attached a picture of my work, which includes a diagram of the problem, and wanted to know if my thought...

Homework Statement Positive charge +Q is distributed uniformly along the +x axis from x=0 to x=a. Negative charge - Q is distributed uniformly along the +x axis from x=0 to x=-a. A positive point q lies on the positive y axis, a distance y from the origin. Find the force (mag and dir.) that...

Homework Statement A conducting sheet 10m x 10m x 1mm carries a charge of 1 mC. What is the electric field magnitude in kV m-1 just above the centre of the sheet?Homework Equations ρ=Q/Volume E=ρ/2ε0 The Attempt at a Solution I have arrived at an answer by the following: ρ = 1x10-3C / 10m...

I have a question about the electric field of a uniformly charged disk with radius a. I'll move point by point till i reach the part i really can't get. First of all, the surface area is made of infinite number of RINGS! So, we basically integrate the charge of the rings from r="0" to r="a"...

Hello, could you please share some insights on the matters I'm about to ask. The examples will be without any numbers of real physical dimensions more like theoretical concepts. In a fluorescent lamp or gas discharge lamp the electrons flow from cathode to cathode(anode ??) as I believe...

I'm a little disappointed in myself for not being able to calculate this or find the answer online, but I've hit a bit of a mental block so I was hoping someone could help me out a bit. I was doing a thought experiment involving kerr-newmann black holes, and basically I would like to calculate...

Homework Statement Two thick, parallel plates of thickness d and uniform charge densities (Coulombs per unit volume) ρ and −ρ are placed next to each other, as shown in the figure. The negatively charged plate is located between –d and 0 on the x-axis and the positively charged plate...

Homework Statement Two charged spheres are brought into physical contact with each other. Initially, the charge on the first sphere was 2.34 nC, while the charge on the second sphere was -3.23 nC. a) What is the final charge (in C)on either charge?(2A) b) How many electrons moved...

Homework Statement "Two balloons are rubbed with wool. Let us assume that the two balloons are at rest (in equilibrium), have unequal charges (Q > q) and unequal masses (M > m). In which string is the tension greater, T1 or T2? Show your work for your conclusion.

When something is charged, is the number of excess electrons a large or small number when compared to the total number of atoms?

Hi, Is there a device that can attract alpha or beta particles and focus them on a point. Something like the reverse of a CRT tube for electrons. BR, Adam

Homework Statement A charge per unit length +λ is uniformly distributed along the positive y-axis from y = 0 to y = +a. A charge per unit length −λ is uniformly distributed along the negative y-axis from y = 0 to y = −a. Write an expression for the electric field at a point on the x-axis a...

Hello, I am looking at an example of finding the charge of a uniform disk with a continuous charge on the surface. They go about the problem by finding the infinitesimal charge of concentric rings dq = σdA = σ(2πr dr) The part I don't understand is that they use the area as 2πr dr...

Homework Statement A rod 11.9 cm long is uniformly charged and has a total charge of −17.7 μC. Find the magnitude of the electric field along the axis of the rod at a point 46.2418 cm from the center of the rod. The Coulomb con- stant is 8.98755 × 109 N · m2/C2. lecture problem I am...

Homework Statement A question involving the relationship between the electric field E(r) and the electric potential V( r) is about computing the electric field on the z-axis due to a uniform line charge distribution λ spread out on a semicircle of radius R, lying on the first half of the XY...

Homework Statement A metal sphere of radius r0 = 0.29 m carries a charge Q = 0.90 µC. Equipotential surfaces are to be drawn for 100 V intervals outside the sphere. Determine the radius r of the following equipotentials from the surface. a) first:___m b) tenth:___m c) 100th:_____m...

Problem Two small identical small spheres with mass m are hung from insulating threads of length L, as shown in the figure. Each sphere has the same charge q1 = q2 = q. The radius of each sphere is very small compared to the distance between them, so that they may be considered as point...

Gauss' Law has been fairly tough for me and I seem to be struggling to analyze situations properly and, specifically, decided on the net charge included in arbitrary symmetrical-shapes used for this law. Specifically, this one includes two spherical shells. Homework Statement A point charge q1...

Homework Statement What is the electric potential two-fifths of the way through a parallel-plate apparatus (from the positive plate) if the plates have a total separation of 5cm and field strength of 5000N/C.Homework Equations Difference Potential Energy = Electric Field Strength x Distance V =...

Homework Statement Two charges with magnitude (Q) experience a force (F) when held a distance apart. Rank from smallest to largest the forces between charges of the following magnitudes (q), held the following respective distances (r) apart. (There may be ties.) A) q= Q/3 r= R/3 B) q= 2Q...

http://www.cnn.com/2013/01/23/showbiz/charlie-brown-actor-arrested/index.html?hpt=hp_t3

Homework Statement Hi, I have a problem that describes a uniformly charged disk and the electric field a distance z from the center. I have found an equation that describes the E field at any point z already. Now I have to find out how the E field decreases as z increases-- as 1/r^2...

A disk of radius 2.4 cm carries a uniform surface charge density of 3.1 μ C/m2. Using reasonable approximations, find the electric field on the axis at the following distances. I have used the equation E=(Q/ε0)(1/(4*pi*r2)) I also tried the equation E=(Q/2(ε0))(1-(z/(√(z2)+(r2))) Thanks...

Homework Statement Homework Equations V = kQ/r PE = Vq The Attempt at a Solution Tried a lot of ways... get an order of magnitude less than the answer and also off by a bit too. Please help. I think you are supposed to take V at each location then multiply by q since this is PE. I carry...

Charged Sphere with a Hole -- Check my work? Homework Statement You have a spherical shell of radius a and charge Q. Your sphere is uniformly charged except for the region where θ<= 1° (which has σ = 0). Imagine that your field point is somewhere on the positive z-axis (so z could be...

I was wondering about what the wavefunction of a particle in a magnetic field would look like, so after some quick work and a little research, I found the the Hamiltonian is \hat{H} = \frac{(\hat{p}+qA)^{2}}{2m} where A is the vector potential such that B=∇×A. I thought that the vector...

Homework Statement Homework Equations a(+) = (-ip+mwx)/(2hmw)^1/2 a() = (+ip+mwx)/(2hmw)^1/2 The Attempt at a Solution can i use these operators to solve this problem? please help me i need to give this homework tomorrow morning :confused:

If I charge a van de graaff to say 10,000 V I would think of the voltage as electric pressure. There would be so many electrons looking to escape the metal ball, and this overcrowding of the electrons (electrostatic forces) would create electric pressure, or voltage. If my analogy is off, then...

hi PF, i got a question in my mind while studying electrostatics that Will a charged particle loose its charge if it travels with a speed a) Less than speed of light? b) Close to speed of light?

I have a conceptual doubt concerning capacitors. Suppose that I connect the terminals of a resistor to a charged capacitor, so that current will flow through the resistor. Usually, in calculations involving capacitors, the electric field outside the capacitor is taken to be zero, because it is...

Homework Statement A particle with a charge of 3.2x10^-19 C accelerates from rest between two charged plates. The electric field is uniform and is 39000 N/C. The distance between the plates is 4.5x10^-3 m. A) Calculate the force on the particle B) How much work is done by the electric...

...Considering there is NO dielectric breakdown or breaking of glass/dielectric..... Can there be a corona discharge ever around a charged glass/dielectric without a conductor in the vicinity? For instance; take a single-electrode glass high-vacuum tube, charge it to high voltage...

Homework Statement 1. Given a coloidal polystyrene particle with a diameter of 350 nm and a surface charge of 7.73. µC cm-2 evaluate: a) the electrostatic energy under and applied voltage of 100 mV Homework Equations particle charge density: ρ = (3Q)/(4πR^3) U0 =∫V (r)dq The...

...plate of a different capacitor, why won't the positive end of a battery (lets say AA) pass current to the negative plate of a different AA battery. Does it have something to do with the chemical reaction that happens inside the battery?

Hi, how to calculate the force on a charged conductive body (ball), when that body is between two parallel plates (+V, -V) (see image), ooh and I am calculating numerically. I would first calculate the surface charges on the conductive surfaces (2 disks + ball), then calculate the potential...

I'm studying A Level physics. I've read that a bubble chamber only shows up particles with a charge, as they ionize the hydrogen in the chamber, leaving tracks, whereas neutral particles don't show up. Is it therefore true then that only charged particles ionize? Because UV-radiation is ionizing...

I need to know how to find the kinetic energy of ions leaving a charged plate. I figure I can find the electric potential energy, but all i know is the power being supplied to the plate and the plate's cross-sectional area. Any ideas? Thanks in advance!

Homework Statement I already worked out the right hand side. What is giving me problems is figuring out the left hand side, ∫Bdl Since B is uniform, it can be removed from the integral leaving B∫dl now I'm stuck. Homework Equations The Attempt at a Solution

Homework Statement OK first, I didn't know where to post this since it is and is not homework,anyways, posting here would be safest. Now, the attached scan is a proof from my (not so trustworthy) textbook and I have some doubts in it. The first doubt is in statement S1 : Every element...

Hi, I have read about electric charge and tried to understand one particular thing but still couldnt: If we positively charge a big metal plate with very high voltage and approach to it a small solid neutral metal sphere, the smaller sphere obviously will get attracted, i.e. a force will...

The electric field strength inside a conducting charged sphere is zero, but why? In the book it says "that the field lines would link charges of opposite sign in the sphere and such a state of affairs is impossible under static conditions in a conductor." I don't really get this sentence. And...

I have this project that involves the runge-kutta method, and I honestly have no clue what I am doing. I never learned about this before, and I don't know much about ordinary differential equations. I am learning all of this next semester but it is required information for this project. In...

Homework Statement One type of ink-jet printer, called an electrostatic ink-jet printer, forms letters by using deflecting electrodes to steer charged ink drops up and down vertically as the ink jet sweeps horizontally across the page. The ink jet forms 30-μm-diameter drops of ink, charged...

Hello ladies and gentleman! I have a question that I have been wondering about for some time now. Does a particle with mass m and charge q have a larger gravitational field than a particle that is the same with mass m but no charge? I am assuming that the particles are static. I thought that...

Can anyone tell me some fluids that are electrically charged? And if it would be safe for, let's say, a fly to consume?

1. Two small metal spheres with masses 2.0g and 4.0g are tied together by a 5cm long massless string and are at rest on a frictionless table. Each sphere has a (mue)c charge. The string is cut, what are the velocities of the sphere when they are far apart I know two conservative qualities are...

Imagine an electron of mass m_e inside a hollow dielectric sphere. Assume that the electron is traveling with constant velocity v relative to the sphere. The momentum of the system p comprises just the momentum of the electron p = m_e v There is also a circulating magnetic field B...

[H3O]+ has an extra electron, so shouldn't it be negatively charged? Similarly, [NCO]-, with (for simplicity sake) a ressonance structure of N=C=O means N needs an electron, and thus the whole molecule is short of one electron. Doesn't that mean it is positively charged?