Charges Definition and 1000 Threads

Homework Statement The point charges in the figure have the following values: q1=+2.1μC, q2=+6.3μC, q3=−0.89μC. Suppose that the magnitude of the net electrostatic force exerted on the point charge q2 in the figure is 0.57 N . Find the distance d and the direction (angle) of the net force...

Homework Statement Homework Equations |E| = (Kq)/r^2 The Attempt at a Solution I'm not really sure if there is a difference between part (a) and part (b)

Homework Statement In the figure the four particles form a square of edge length a = 6.10 cm and have charges q1 = 6.35 nC, q2 = -17.9 nC, q3 = 17.9 nC, and q4 = -6.35 nC. What is the magnitude of the net electric field produced by the particles at the square's center? Homework Equations...

Are there any particles known in the Physics world with an either positive or negative charge that can be viewed by the human eye under LED light illumination and have an attraction/repulsion to magnetism?

Does anyone have a formula and derivation of the force between two charges in the presence of two dielectric media. Specifically, have the two dielectric media separated by a plane at z = 0. I have a developed a solution using image charges to matched the boundary conditions at the dielectric...

There is charge ##q_0## which is fixed.from a distance far away another charge ##q_1## is fired towards it with speed ##V_0## then we know as both of these are positive charges these will repel each other as the charge ##q_1## comes closer. While coming closer to ##q_0##, it's speed decreases...

The book I'm reading is discussing the physics of semiconductors. I'm having a hard time understanding a passage in section introducing n-type semiconductors. (Phosphorus is used as the impurity) The book says: "At normal operating temperatures, this extra electron breaks its bond with the...

Homework Statement A charge (q) is placed in-between two other equal charges named Q. Q-----q-----Q a) If both Q's are positive, is charge q in equilibrium? If yes, is it a stable or unstable equilibrium? b) What about if one Q is negative while the other is...

Homework Statement Hello. I am having trouble understanding this particular statement found in one of my textbooks. " Work done to move a charge along a line perpendicular to the field is zero" The Attempt at a Solution Field is a space around a charge where if we place any other charge...

When a capacitor is connected to battery then positive charge is induced on one plate and a negative charge is induced on another plate.Now what happens to the charges that are induced on opposite sides of each plate i.e. on plate with positive charge a negative charge would be induced on...

Homework Statement IF the resultant electric field at D due to the three point charges is zero, find the magnitudes of q1 q2 in terms of q [/B]...

Homework Statement Q If an object having charge 'q' is brought near an uncharged conductor (sphere) , would the charge induced on the nearby surface ( closer to the charged object ) be equal to '-q' ? Homework EquationsThe Attempt at a Solution I think the charge induced would be less than...

Homework Statement If there is an uncharged metal spherical body and a charge q outside it .Find Electric field due to induced charges. Homework Equations ##E##=##\frac{Kq}{r^2}## The Attempt at a Solution If there is an uncharged metal spherical body and a charge q outside it then there will...

Homework Statement There are three point charges inside a conducting spherical shell of radius R. One of them of charge -2q is in the origin and the other two with charge q are in z=d and z=-d. Find the potential inside the sphere! Homework Equations ##\nabla^2\phi=4\pi \rho## 3. The attempt...

Homework Statement I'm having a bit of trouble evaluating the following commutator $$ \left[T^{+},T^{-}\right] $$ where T^{+}=\int_{M}d^{3}x\:\bar{\nu}_{L}\gamma^{0}e_{L}=\int_{M}d^{3}x\:\nu_{L}^{\dagger}e_{L} and...

Hello. I am an intro Physics student and this is my first post here. In Coulomb's law the charges are said to be stationary. I need some clarification about what does it mean for two charges to be stationary: A. Does it mean that the charges are not moving with respect to each other? (But...

Find the force on 2Q and -Q/22. Force between two point charges is given by : F = k.q1.q2 / d[2][/SUP]The Attempt at a Solution To find the force on 2q, I added the charges on left side and then calculated it using the formula. But how do we do it for -Q/2. Please guide me. Thanks

Homework Statement Consider two solid dielectric spheres of radius ##a## separated by a dis- tance ##R## (##R\gg a##). One of the spheres has a charge ##q## and the other is neutral. We scale up the linear dimensions of the system by a factor of two. How much charge should reside on the first...

Homework Statement The Attempt at a Solution Now, they're in series, so I found the equivalent capacitance to be about 0.57 microFarad. And I have technically gotten the correct answer according to the back of the text. The question in the text clearly asks for the charge on each...

Figure (a)shows two concentric conducting shells .Some charge Q1 is given to the outer shell.No charge is developed on the inner shell.I want to know why?When charge is on inner sphere ,charges also develop on outer shell then why not charge develops on inner shell when there are charges on...

i can't seem to get a handle on this...help :)

Are there any particles which have a neutral electrical charge and are not affected by the weak or strong nuclear force? Thank you for your time and please excuse me if I'm being very ignorant!

Homework Statement Homework EquationsThe Attempt at a Solution the answer for d comes out to be 0.017 m. BUT, if we kept with tan instead of switching to sin, we would have mg(d/2)/ mg =kq q / d2 d^3 = 2k q q solving for d d = 0.0121 m clearly on a big scale, the two answers are about...

Homework Statement A triangle is given with the points: Q1 = +2.0 x 10-5 C 2.0 m from Q3 = -3.0 x 10-5 C AND Q1 = +2.0 x 10-5 C 2.0 m from Q2 = -3.0 x 10-5 CThe triangle is a right triangle, with Q1 at the 90 degree angle.FIND THE NET FORCE OF CHARGE 1Homework Equations [/B] FE21 = FE31...

I am not able to understand electric currents. Can anyone explain?

At the outset, I want to explain that this is a problem I came up with myself. It's not actually homework, and I suspect it is deeply conceptually flawed in some manner that I have yet to determine. 1. Two point charges of like polarity, ## q_1 = q_2 = 1C ##, start out separated by distance ##...

Homework Statement 1. Compute the electric field vector at the position of charge B for the case where q_{A}=4q_{C} and r_{1}=2r_{2} 2. Suppose that all three charge are positive and that q_{A}=4q_{C} . Consider the case where f q_{B} is moved to the right by a distance dr. Now r_{1} = 2r+dr...

Hi, I am learning about the method of image charges, but am struggling to sufficiently justify my answer. It appears to be correct, though it quite possibly isn't... 1. Homework Statement (please see attached item) Two semi-infinite grounded conducting planes (the shaded region in the...

How to find potential ENERGY between two point charges?I know how to find potential difference between two points and I also know how to find potential at any point . potential difference between two points 1 and 2 is simply ##V1##-##V2## potential at any point r=V While source charge is Q...

Homework Statement I need to solve a bit of a simple "reverse" problem that I'm unable to find treated in any detail, probably because it's actually reasonably straightforward. What I need to do is to "compute the charge and current distribution that give rise to [the following] field."...

Hello, So, I know quarks are confined in baryons. In a proton, there are "3" quarks, but the sum of their masses is not the mass of the proton. This implies a major fraction of the proton mass comes from interactions. My question is, how then do they measure quark u and d masses? And...

Homework Statement Consider the figure below, we need to find the charge on Q_0, both charges Q are negative. It is given that the net charge on Q_A is zero. The figure of the problem is attached. The Attempt at a Solution I understand how to get the solution except for one part. I'm just...

Homework Statement A rod carrying a charge of 8.0uc held above a balloon carrying a charge of -.70 uc. at a height of 30cm. find the mass of the balloon Homework Equations fe= (q1*q2)/r^2[/B] F=ma The Attempt at a Solution I do not want this problem solved for me I am very trapped at...

Homework Statement Four charges of 2*10^-7 are placed on the corners of one face of a cube of 15 cm. A charge of -2 * 10^-7 C is placed at the center of the cube. What is the force on the charge at the center of the cube? Homework Equations F = k q_1*q_2/r^2 The Attempt at a Solution...

Homework Statement The figure to the right shows two concentric spheres made from insulators. One has radius and the other has radius R1, and the other has radius R2. The inner sphere has a positive charge density, +ρ, while the insulator region between the inner and outer spheres has a...

In my head, I'm using (delta)(gravitational potential energy) as an analogy to the (delta)(electrical potential energy). So, with a DC circuit with loads connected in series, we can observe a voltage drop across each load. Now, because the current remains the same throughout, it must mean that...

We have a question about finding the electrostatic force acting on a particle from another particle. They are colinear since there is only the 2 particles, but not along an axis. My question is, why does finding the force in the x direction and finding the force in the why direction, then...

I can't think of a situation where we can utilize greens function without the presence of a point charge. let's consider the following equation: \Phi=\frac{1}{4\pi \epsilon} \int dv \rho(x')G_{N} (x,x')+ \frac{1}{4\pi} \int da F_{s}(\rho , \phi) G_{N} + <\phi>_S Here we see that a volume...

Homework Statement The potential energy of a system of two charges (q1 = 5.0 µC and q2 = 3.3 µC) is 0.37 J. What is the distance between the charges? Homework Equations U=(kq_0q)/r --> r=U/(kq_0q) U=V/q_0 V=0.37J q1 = 5.0 µC q2 = 3.3 µC The Attempt at a Solution So I was going to use...

Homework Statement Two charges q1=+9c and q2+-1c are separated by 2m. Where is their neutral point? Homework Equations E = E(+) + E(-) E= k q/r^2 The Attempt at a Solution k q1/(2+x)^2 = -(k q2/x^2) When I solve for this equation I end up square rooting a negative number which would then...

Homework Statement In the figure particle 1 of charge q1 (at origin) and particle 2 of charge q2 = 3q1, are held at separation L on an x axis. If particle 3 of unknown charge q3 is to be located such that the net electrostatic force on it from particles 1 and 2 is zero, what must be the (a)x...

Homework Statement I need to find the magbitude of charges Lenght of string - 50 cm mass of balls - 0.2 grams theeta - 37 degrees Homework Equations K-8.99x10^9 [/B]The Attempt at a Solution I found that half the distance between the balls is 15.9 cm but i don't know how to continue[/B]

Homework Statement Four equal point charges q = +22.4 μC sit at each corner of a square. What charge Q, in μC, must be placed in the center so all the charges are in equilibrium? Your answer must include the sign of the charge. Homework Equations F = q1*q2 * k / r^2 3. The Attempt at a...

Homework Statement Find the electric field (both magnitude and direction) at point P located between the charges q1 = -3C and q2 = +4C. Point P is 1/3 of the charges' separation distance from q1 and 2/3 of the charges' separation distance from q2. Homework Equations E = kq/d^2 Etotal = E1 + E2...

Why is it that the electric field at Z due to Q1 and Q3 have their horizontal components cancel and also why is the resultant for E1+E3 result in the negative z directiom?

Induced charge can never be greater than inducing charge ,but can it be equal to inducing charge?I think yes.But in my book it is given that "In induction the charge induced in the near surface of a dielectric is lesser and dissimilar, lesser implies not equal.Why? I think it is something to do...

Homework Statement I'm given an equilateral triangle of side length b with charges q at each corner and I have to find the y coordinate for point P on the y-axis where the electric field is equal to zero (E=0 other than the center of the triangle) 2. The attempt at a solution I figured I'd...

A molecule of DNA (deoxyribonucleic acid) is 2.09 µm long. The ends of the molecule become singly ionized: negative on one end, positive on the other. The helical molecule acts like a spring and compresses 1.09% upon becoming charged, and remains in this equilibrium position. Determine the...

Homework Statement Two point charges are placed on a horizontal line, the first is +3.0-μC located at x = 0.0-m, y = 0.0-m and the second is -4.0-μC located at x = 2.0-m, y = 0.0-m. At what points on the horizontal line y = 0.0 will the electric potential be zero? Homework Equations V(r)=kq/r...

Hello, I know you can use Gauss' law to calculate the electric field of volume and surface charges but i cannot figure out a way to do it using Coloumb's law. I have several questions about this: when you integrate the charge density in Coloumb's law over the volume is the r^2 inside or outside...