Charges Definition and 1000 Threads

Homework Statement Two point charges, one with charge +q and the other with charge +9q, are placed a distance "d" apart. It is possible to place a third charge so that the net electrostatic force on all three charges is zero. What are the sign, magnitude, and position of this third charge (in...

Homework Statement The attractive electrostatic force between the point charges 8.12×10−6C and Q has a magnitude of 0.670N when the separation between the charges is 7.26m. Find the sign and magnitude of the charge Q. (this is a direct cut and paste) Homework Equations...

Homework Statement A charge of 6 mC is placed at each corner of a square .1 m on each side. Determine the magnitude and driection of the force. Homework Equations The Attempt at a Solution so i found the force between corner 1 and 2 then 1 and 3 to = 32.4N and the force...

Hi, Pls I'd like to find out if 2 electrical charges (same charge but different voltages) would attract or repel. For example -600VDC and -100VDC. I've always thought like charges repel and unlike charges attract. But I'm reading up on something that says the above would attract and become...

1. Homework Statement A capacitor of capacitance C id charged by a battery of emf E and inernal resistance r, A resistance 2r is also connected in series with the capacitor. The amount of heat liberated inside the battery by the time capacitor is 50% charged is? Answer is E2/C 2...

Homework Statement Consider a charge of +2.0 µC placed at the origin of an X-Y co-ordinate system and a charge of -4.0 µC placed 40.0 cm to the right. Where must a third charge be placed – between the charges, to the left of the origin, or beyond the second charge – to experience a net force of...

why do positive and negative charges attract each other?

Homework Statement A lab we were recently given in AP Physics class contained an equation already derived. This lab was about determining the charge on a pith ball, using the static charge of a fur to charge the balls negatively, so they repel. Finding the angle and distance between the two...

Hello, As many people, I have been fascinated by the "Classical electrodynamics in terms of direct interparticle interaction" theory developped by Feynman and that he abandonned later. This is a representation of electrodynamics where fields play no direct role: they do no appear in the least...

1. Homework Statement Here is the picture with the arrows representing Electric Fields. a. Can you find any test charges on the xy plane? Where? b. Where can you find a magnetic field? 2. Homework Equations No idea... Amperes Law? 3. The Attempt at a Solution I just...

Hello, I'm having a little trouble with this: Coulomb Force Point Charges on Cube Homework Statement Identical charges of Q (C) are located at the eight corners of a cube with side L (m). Show that the coulomb force on each charge has magnitude: 3.29Q^2/4\pi\epsilon_0l^2 Homework Equations...

I have been trying to remember if in classical EM it is equivalent to describe magnetization through bound electric currents A. \vec{j_b} = \nabla \times \vec M \vec{k_b} = \vec M \times \vec{\hat{n}} OR bound magnetic charges B. \rho_b = -\nabla \cdot \vec M \sigma_b = \vec M \cdot...

I've been working on this problem and I cannot find out where I am making a mistake. Homework Statement Two charges, each with a value of +q, are placed a distance d apart on the x-axis. Find the potential at a point P a distance z above the x-axis on the z-axis The Attempt at a Solution The...

Homework Statement Two negative electric charges, (Charge A on the left, and Charge B on the right) each with a charge of 3.0 x 10-5 Coulombs are fixed at a distance of 2.9 meters from each other. Find the electric force of charge A on charge B. (Don't forget, if the force points to the left...

Homework Statement here's how the question goes: the magnitudes of the charges on two identical small metal spheres are in the ratio 5:1. the coulomb interaction force between them is F1. if they are brought into contact and then separated to their respective original positions, the coulomb...

Homework Statement Point charges of 12x10-6, -7x10-6 and 4x10-6 are located at (2,0,-1), (1,1,2) and (2,-1,2). a. Determine D(flux density) and E(electric field strength) at (1, -1, 3). b. What is the flux passing through the sphere of radius of 2.5 centered on the origin Homework...

Homework Statement A 4microC point charge is placed at the coordinate origin. Two other point charges are placed on the x axis: q1 at x=30cm and q2 at x=50cm. Find the magnitude and sign of q1 and q2 if the net force on each of the three charges is zero. Homework Equations...

Homework Statement Two point charges are placed on the x axis: +5 microC charge at x=0 and +8 microC charge at x=0.9m. Where on the x-axis can a third charge be placed so that the net charge on all three charges is zero? Determine the magnitude of the third charge. Homework Equations...

Homework Statement Two pith balls equally charged and each with mass of 1.5g. While one ball is suspended by a thread, the other is brought close to it and a state of equilibrium is reached. In that situation, the two balls are separated by 2.6cm and the thread is attached to the suspended...

"When we touch a pith ball with an electrified plastic rod, some of the negative charges on the rod are transferred to the pith ball and it also gets charged." I want to know how does this happen ?

Homework Statement Griffiths 3.36: Two straight wires having equal and opposite line charges are situated on either side of a conducting cylinder (all the wires and the cylinder are "long", so we can ignore edge effects--this is undergraduate electrostatics, after all!). The cylinder has no...

The charge of an electron is exactly equal in magnitude to that of a proton (2 up quarks plus down quark). What is the theoretical basis for this, or is essentially a fact of nature that is accepted?

Homework Statement why should experiemnts related to static charges be carried out on dry days? Homework Equations I know this somehow relates to the moisture in air. yet, I do not understand the concept behind. The Attempt at a Solution Do the sparks...

1. Two point charges 3.0 cm apart have an electric potential energy -120 microJoules. The total charge is 30 nC. What is the lesser charge? What is the larger charge? 2. Uele=qv Uele=q1(kq/d) 3. My professor gave me these equations, I'm not entirely sure if they're the right ones...

If there are two plates with +2Q and -Q, what is the charge distribution on the four faces? I would assert this is the only solution S1--------------------------- (+0.5Q) S2--------------------------- (+1.5Q) (space) S3--------------------------- (-1.5Q)...

Final distance between two charged, identical particles approaching each other Homework Statement Two identical particles, each with a mass of 4.5 mg and a charge of 30 nC, are moving directly toward each other with equal speeds of 4.0 m/s at an instant when the distance separating the two...

Homework Statement Three point charges, which initially are infinitely far apart, are placed at the corners of an equilateral triangle with sides "b". Two of the point charges are identical and have charge "q". If zero net work is required to place the three charges at the corners of the...

[b]1. Two point charges of equal magnitude are 8.4 cm apart. At the midpoint of the line connecting them, their combined electric field has a magnitude of 45 N/C. Find the magnitude of the charges. [b]2. E=k(q)/r^2 [b]3. I've tried 45= 8.99x10^9(q)/(.084)^2 and got q to equal 35...

A Particle of charge q=7.5x10^-6 Coulombs is released from rest at .6m on the x axis. The particle moves due to charge Q = -20x10-6 C. What is the Kinetic Energy of the particle the instant it has moved .4 meters if Q stays fixed at the origin? Here I used KE1 + U1 = KE2 + U2 Which equals 0 +...

I have some difficulties grasping the idea of this equation Wp = q * E * r Where Wp - electrical potential energy q - charge E - the strength of the electric field r - radius, or distance from the other point charge So basically, say we have 2 point charges. One positive, and one...

Homework Statement http://www.screencast.com/users/trinhn812/folders/Jing/media/8fe997e1-46e5-4033-a246-fbad0acb7162 Homework Equations The Attempt at a Solution I understand that in question 25, the conductor becomes polarized and its negative charges will be more attracted...

Homework Statement Calculate how much work it takes to make a square of side length A with point charges (all of charge q) at each vertex. Homework Equations The Attempt at a Solution I know one way to do it. (find the difference in potential for each point and then go from there...

Homework Statement A charge of 0.611 nC is placed at the origin. Another charge of 0.383 nC is placed at x1 = 8.1 cm on the x-axis. At which point on the x-axis does this potential have a minimum? Homework Equations U=(kq1q2)/rThe Attempt at a Solution I really have no idea how to even start...

Attraction between nuclei and electron in QED is the most simply described with Feynman's diagram and calculation, when an electron fastly flow close to a nuclei. (?? scattering) 1. But how, in QED, to describe attraction between almost standstill electron and nuclei. In classical physics...

Hi I'm having difficulty understanding why the solution for the answer to the following problem is worked out this way. Three spheres are placed at fixed points along the x axis, whose positive direction points towards the right. Sphere A is at x=47cm with a charge of 5x10-6C Sphere B is...

A small sphere of mass 1.0 x 10^-6 kg carries a total charfe of 2.0 x 10^-8 C. The sphere hangs from a silk thread between two large parallel conducting plates. The excess charge on each plate is equal in magnitude, but opposite in sign. The thread makes an angle of 30 with the positive...

Homework Statement Attached figure. 3 charges : q1, q2 and q3 are on a plane (for simplification). We want to compute the resulting charge at some point of the plane. 1/ Is it possible to sum (for computation) these charges to an arbitrary point A? 2/ or B? Homework Equations these...

QUESTION 1 Homework Statement Two positive charges, each with Q = +10 µC, are fixed to the x-axis at x = +a and x = -a, where a = 4 m. (a) Find the electric potential at point A on the y-axis where (xA, yA) = (0, b) and b = 5 m. Take the zero of potential to be at infinity. (b) A...

Homework Statement 3 point charges are fixed in place in the right triangle shown below, in which q1= 0.67 microC and q2= -0.67 microC. What is the electric force on q3 with +1.0 microC due to the other two charges? Magnitude? direction, measured counterclockwise from the +x axis? **HYP=10cm...

Q1. If two point charges have equal mass and and charg are released on a frictionless table, each has an initial acceleration (Ao). if instead you keep one fixed and release the other one, what will be its initial acceleration?Ao,2Ao or Ao/2? Q2. A point charge of mass (m) and charge (q)...

Homework Statement A point charge of -6 µC is located at x = 1 m, y = -2 m. A second point charge of 12 µC is located at x = 1 m, y = 3 m. (a) Find the magnitude and direction of the electric field at x = -1 m, y = 0. (b) Calculate the magnitude and direction of the force on an...

Homework Statement Grounded conductive spherical shell is given. Radius R. Charge is held in d and (-d). d>R. as in the pic. What is the force on the right charge? Homework Equations F=q*q/r^2 The Attempt at a Solution I thought it's just F=(q^2)/(4d^2). Why it's wrong? the right...

Hi all, Here is my problem: Two positive points charges are situated as the initial figure: 1/ How to compute the voltage between A and B (or C)? 2/ If the final condition is like described in the second figure, what is now the voltage between A and B. 3/ if the transition between the...

A fixed point charge of +2q is connected by strings to point charges of +q and +4q, as shown below. Find the tensions T1 and T2. (Use the following as necessary: q, d and k.) For T1, I summed all the forces on each charge and got...

When using the method of image charges to solve a problem in electrostatics, how do we determine the volume of space in which our solution is valid? And how do we find the solution outside this volume? To be more specific, let's consider two examples. The first is the classic point charge above...

Two charges are located on the y-axis at positions -2 microC @ (0, 2m) and -1 microC (0,-2m). What are the x and y components of the electric field at position (2m,0)?

Consider the arrangement of two fixed point charges, equal in magnitude... Consider the arrangement of two fixed point charges, equal in magnitude, shown in the figure. Which of the following statements are correct for the initial motion of a third charge if it is released from rest in the...

Homework Statement Three charges are at the corners of an equilateral triangle, as shown in the figure below. Calculate the electric field at a point midway between the two charges on the x-axis. Magnitude: Direction below the x-axis in degrees. Homework Equations F=Ke*q/(h)^2...

Homework Statement Three point charges are located at the corners of an equilateral triangle as in the figure below. Find the magnitude and direction of the net electric force on the 0.40 µC charge. (A = 0.20 µC, B = 6.60 µC, and C = -3.80 µC.). Diagram below... Homework Equations F=...

Scene in my book, in the United States. So some guy wants to maybe shoot someone, maybe just scare someone, whatever. But at some point the gun goes off and kills a bystander. Would this be involuntary homicide? Involuntary manslaughter? Any other charges a prosecutor might add? The...