Charges Definition and 1000 Threads

Homework Statement Particles 1 and 2 are fixed in place on an x-axis at a separation of L=8cm. Their charges are q1=e q2=-27e. Particle 3 with charge q3=4e is to be placed on the line between particles 1 and 2, so that they produce a net electrostatic force F3net on it. a) at what...

The circular loop carrying current experience a tension in external magnetic field.how can this tension be calculated and why doesn't it make a circular motion.

q1___________Q___________q2 10cm 10cm In the figure above the charge in the middle is Q=-3.1nC. For what charge q1 will charge q2 be in static equilibrium? Relevant equations I think that F=kq1q2/r^2 is relevant my attempt at a solution Since the ions are...

Homework Statement After induction, the cola can has +ve charges on one end and the -ve charges on the other end. Now when we touch cola can with our hand, why does electrons start flowing through it and get grounded. Doesn't the +ve charges on the one end of the can attract the -ve...

We all know that energy is required for exerting a pull or push on anything. The amount of energy exerted is proportional to the amount of force exerted and the time period. So if we place 2 like charges near each other, then what energy do they utilize to exert repulsion force on each other.

Homework Statement Two identical point charges, q1 = +2.5 x 10-6 C and q2 = +2.5 x 10-6 C, are placed as shown in the diagram below. Point P is a distance 0.05 m from q1 and 0.12 m from q2, such that the angle at P is 90 degrees. Calculate the magnitude of the Electric field E at point P...

Homework Statement Two positive point charges, ##q_A## and ##q_B## (masses ##m_A## and ##m_B##) are at rest, held together by a massless string of length ##a##. Now the string is cut, and the particles fly off in opposite directions. How fast is each one going, when they are far apart? [from...

Homework Statement Suppose that we changed the right-hand charge in the image attached to -q (instead of +q); what then is the potential at P? What field does that suggest? Compare your answer to Prob. 2.2 [answer written below] and explain carefully any discrepancy. Homework Equations...

Homework Statement Two particles A and B having equal charges +6C, after being accelerated through the same potential difference enter a region of uniform magnetic field and describe circular path of radii 2 and 3cm repectively. The ratio of mass of A and B is ______ Homework Equations Force...

Homework Statement Hi! This is not really a problem. I'm just confused on how to express the charge distribution of a set of point charges in spherical coordinates. From our discussion, ρ(\vec{r})=\sum\limits_{i=1}^N q_i δ(\vec{r}-\vec{r}') where \vec{r} is the position of the point where...

Homework Statement An electric dipole consists of a pair of equal but opposite charges, +Q and -Q separated by a distance d. What is the electric potential at the point that's midway between these source charges? Through using the formula electric potential = kQ/r, I found the electric...

Homework Statement Why do negative charges spontaneously accelerate? The book I am studying from asked me to verify this statement: Negative charges spontaneously accelerate and increase in kinetic energy when they move toward a point of higher potential. I don't understand why...

Consider two equal and opposite charges moving in the same direction and velocity v0, and are separated a distance R. There will always be an attractive electromagnetic force Fel=q2/(4πεR2), but when they are moving, they will produce a magnetic field B=μqv/(4πR2), and thus a repulsive magnetic...

Consider an equilateral triangle of side 15.6 cm. A charge of +2.0uc is placed at one vertex and charges of -4.0C uc each are placed at the other two, as shown in the diagram to the right. Determine the electric field at the centre of the triangle ANgle= 60 sides--> d1= d2=d3=0.156m...

I was reading about high voltages machines that accumulate charges and i found out that we can't accumulate much , because eventually the voltage will break down the air near the surface of the sphere ( corona discharge) , what if we put it at the bottom of the sea , where water ( with bigger...

One of the observation noted in connection with coulomb interaction is that, it is not affected by the presence of other charges. Why? Thanks.

I have heard that when charged particles are accelerated, they emit radiation. Combining this with the knowledge that atoms within a fire, are colliding at more then roughly the order of 1021 collisions per second. Is this why fire emits light? Is it the constant high acceleration from the...

How does a moving point charge affect another point charge moving at the same velocity and separated by some distance in one direction relative to an observer whom the charge are moving? What formula describes that interaction?

First question i have is about the common glass rod-cloth experiment where the one gets plus charged and the other minus charged.The plus charged item how does it get back the electrons that it missed?If we touch it again with the other one or even through the air?And the minus charged how does...

I know it sounds like a really stupid question but i am a bit confused as to what to connect and just want to make sure i do it right. I have a solar panel to charge a set of batteries, i connect the positive wire of the batterie holder to the negative or positive wire for the solar panel, i...

To be concrete, consider two parallel conducting plates, one positively charged and the other negatively charged. Why doesn't the electric field between the two plates pull the charges off the surface of the two plates?

How much energy is needed to place four positive charges, each of magnitude + 5.0mC, at the vertices of a square of side 2.5cm ? I am not entirely sure where to start here. Am I looking for W=? like the work it takes to place it ??

Homework Statement Find the magnitude of the electric field this comination of charges produces at point P, which lies 6.00cm from the -2.00μC charge measured perpendicular to the line connecting the three charges. Homework Equations E=k\frac{Q}{r^{2}} F=k\frac{q_{1}q_{2}}{r^{2}}...

Homework Statement Let L be the length of the conductor having uniform cross-section area A and density, let I be the current passing through the conductor. How the total number of positive charge carriers in the conductor of length L is (nAL)?

Homework Statement We have three point charges Q_1, Q_2, Q_3 , forming together an isosceles triangle. Two sides are of equal length r . The point charge Q_1 is located at (0,0), the point charge Q_2 is located at (x_2,0) and The point charge Q_3 is located at (\frac{x_2}{2},\sqrt{r^2 -...

Homework Statement Two point charges (q1 = -2.6uC and q2 = 8.6uC) are fixed along the x-axis, separated by a distance d = 9.7cm. Point P is located at (x,y) = (d,d) 1. What is Ex(P), the x-component of the electric field produced by q1 and q2 at point P? 2. What is Ey(P), the value of the...

Suppose we have a collection of conductors for which the voltage is specified on some conductors and the surface charge is specified on others. Is there a coherent way to specify this as a boundary value problem for the voltage (satisfying Laplace's, or in the presence of charge density...

Let's say there's an electric current in a neutral loop of wire. Then we change to a frame where the loop is moving. That makes the loop an electric dipole, for us. Then somebody shakes one side of the loop, the positive side for example. Do we observe EM-waves? Here's a picture of the loop...

1.)Two charges are fixed in location: charge q1= +8e is located at the origin and charge q2= -2e is located on the x-axis at x=L. At what point can a proton be placed so that it has net zero force acting on it? 2.)F=kq1q2/r^2 3.)I tried to do F=0 K = 8.988 X 10^9 (constant) q1 = (8...

Homework Statement Find surface and volume charge densities. Deduce electric field. Homework Equations The Attempt at a Solution Volume charge density: \epsilon_0 \epsilon_r \nabla . \vec E = \rho_f Using ##\vec P = \chi \epsilon_0 \vec E = (\epsilon_r -1)\epsilon_0 \vec E##...

A SPHERICAL conductor in electrostatic equilibrium has no further motion of charges within it. From this, it must imply that there is no net electric field in a conductor and this must necesssarily imply that qenclosed is zero. This is fairly easy to see from Gauss's law: (closed)∫E.dA =...

Homework Statement What will be the force between two charges if the magnitude of the charges and the distance between them are reduced by 50% Homework Equations F= [(k)(Q1)(Q2)]/(r^2) The Attempt at a Solution Is it that the charge would be 1/2C then 1/2d, then solve for F

Homework Statement Find the electric field of a charge at a corner if there are 4 equal charges at the corner of a rectangle with sides 40 cm and 20 cm. The charges are 2.5 x 10^3 C. Homework Equations E = (kq)/r^2 The Attempt at a Solution I labelled the top left charge q1, the...

Hello! For Single Charge: I studied the formula for electric potential for a point charge (V=kq/r). It was derived when the test charge approached the source charge from infinity "head-on". In this case the electric field due to source charge and displacement of test charge were vectors in...

Question: Two positive charges q(a) and q(b) and masses m(a) and m(b) are at rest, held together by a massless string of length d. Now the string is cut, and the particles fly off in opposite directions. How fast are each going when they are far apart.My attempt: From this the first thing I...

Homework Statement Consider the triangle of charges diagrammed below, for which d = 5 cm, q = 2 nC, and the +x-axis points to the right. What is the force Fvec on the 1 nC charge? Give your answer as a magnitude and a direction.Homework Equations F=K(q)(Q)/r^2 The Attempt at a Solution I...

Homework Statement Let us have a square ABCD (D is in the topleft corner) of size 1 m. Let us have 3 point charges situated in points B, C and D. The charges are following QB=2C, QC=-1C and QD=5C. The task is to find (a) the points/plane where the electric potential is zero and (b) two points...

Homework Statement Two charges of equal magnitude Q are held a distance d apart. Consider only points on the line passing through both charges. If the two charges have the same sign, find the location of all points (if there are any) at which the potential (relative to infinity) is zero. a)...

Hello, Hi There I am trying to obtain the relations of the conserved charges of the stress tensor, it has 4, one is the hamiltonian and the other three are the momentum components. \vec{P}=-\int d^3y \sum_i{(-\pi_i(y) \nabla \phi_i(y))} And i have to prove the conmutators...

What happens To the force between 2 charges if a metal sheet or a dielectric sheet is kept in between the two charges ..(the charges are in vacuum)

http://puu.sh/7MuKv.jpg I'm not sure what equation to apply in this situation. I'm lead to believe Ke((|q1||q2|) / a) Is what I should be applying.The Attempt at a Solution No idea thus far.

edit: I see that my title is incorrect. This isn't between charges, it is between a charge and a point, sorry about that. The problem: Find the magnitude of the electrostatic force that works on a point 3 meters from q1. q1=3μC My attempts: Feq1=1/(4πε0)*(q1/r) r=3m 1/(4πε0)=8.988x109...

I'm having a hard time understanding why the electric potential halfway between two equal but opposite charges is 0. If I put a positive charge halfway between a 5 mC charge and a -5 mC charge, it will accelerate toward the negative charge, but how can it do this if it starts with no potential...

Homework Statement Three point charges lie along a straight line as shown in the figure below, where q1 = 6.36 µC, q2 = 1.57 µC and q3 = −1.82 µC. The separation distances are d1 = 3.00 cm and d2 = 2.00 cm. Calculate the magnitude and direction of the net electric force on each of the...

Homework Statement Four charged particles are at the corners of a square of side a as shown in the figure below. (Let A = 3, B = 5 and C = 6.) (a) Determine the electric field at the location of charge q. (Use the following as necessary: q, a, and ke.) (b) Determine the total...

Homework Statement Two charges of opposite sign and equal magnitude Q = 0.82 C are held 2.0 m apart as shown in the figure. Picture: http://gyazo.com/a78a049ce0a24ad464fd7bb99dffd665 A) Determine the magnitude of the electric field at the point P. B) Determine the electric potential...

do negative charges in electric fields of positive charges have negative electrostatic potential energy? am I write in thinking they can't be at negative potential (V) because potential is a property of the field and has nothing to do with the charge in the field (like potential energy does)...

Find the Force and Electric field strength experienced by a 25µC charge particle a distance r away from another 8µC charge particle in air for the following distances. I have this table below would anyone be able to help me out would be much appreciated!

Three charged particles are placed at the corners of an equilateral triangle of side L = 1.74 m. The charges are q1 = 3.63 µC, q2 = −8.05 µC, and q3 = −6.31 µC. Calculate the magnitude and direction (counterclockwise from the positive x axis) of the net force on q1 due to the other two...

Consider the following charge distribution:A positive charge of magnitude Q is at the origin and there is a charge -Q on each of the x,y and z axes a distance d from the origin. I want to expand the potential of this charge distribution using spherical coordinates.Here's how I did it...