Charges Definition and 1000 Threads

1. 1: Suppose eight identical point charges q are placed at the corners of a cube with side length L. Find the magnitude and direction of the electric force produced exerted by these charges on another charge q at the center of a face of the cube. Homework Equations 3. So far...

Homework Statement A metal sphere hangs from a string and has 6 kg of mass. The sphere has a charge of +3.7 µC. A uniform electric field is turned on and directed to the right. (a). What is the electric force on the metal sphere if the magnitude of the electric field is 106 N/C? (b)...

Homework Statement The sides of the triangular web have a length of a = 0.74 m, as depicted in the figure. Two of the spiders (S1 and S3) have +6.6 µC charge, while the other (S2) has −6.6 µC charge. a.) What are the magnitude and direction of the net force on the third spider (S3)? I...

Homework Statement Two positive charges of 16 micro coulomb and 4 micro coulomb are separated by a distance 3 m along a straight line...find the spot on the line joining the two charges where Electric field is zero? Homework Equations E = F/Q and F = Q1Q2/R^2 The Attempt at a...

Where is the potential zero? 1. Where is the potential zero between a negative (-.03c) and a positive charge (.27) separated by 1 meter? 2. Point charges laws 3. My textbook doesn't mention where is potential zero between two charges, it's easy to solve if i know the point is in between or...

Three objects (A, B, and C) are brought close to each other one at a time. A and B attract, but B and C repel. Simple true/false question involving "is this one positive/negative/etc." What I'm unsure about is whether or not A could possibly be neutral, or more specifically, is there any way to...

Hello. I am not sure if I must post here. The problem is not for homework, it derived from a classmate's question. Homework Statement We have a large quantity of liquid dielectric with relative permittivity \varepsilon and a charge Q immersed in the liquid in depth h. We bring another...

Homework Statement Four charges are placed at the corners of a square of side length a, as follows : -Q on the top left corner, +Q on the top right corner, -Q on the bottom left corner and +Q on the bottom right corner. Determine the electric field at the centre of the square and determine...

Homework Statement A finite uniform linear charge ρ_L = 4 nC/m lies on the xy plane; start point and end point are (7,0,0) and (0,7,0) .While point charges of 8 nC each are located at (0, 1, 1) and (0, -1, 1). Find E at (0, 0 ,0) Homework Equations dE=ρ_L *dz'/4∏ε *...

Hi, According to what I understood, when a terminal is connected to a line, it causes electrons to flow in one direction. And so for a single phase transmission line in parallel if connected to supply, then in one side electrons will be flowing in one direction and the same electrons will be...

The potential due to a polorized distribution is given by: V( \vec{r}) = \frac{1}{4 \pi \epsilon _{0}} \int _{V} \frac{ \hat{r} \cdot \vec{P} ( \vec{r}')}{r^{2}} dV After working some voodoo math, this is worked into the form V = \frac{1}{4 \pi \epsilon _{0}} \oint _{S} \frac{1}{r} \vec{P}...

Homework Statement "Use the equation I=nAve to justify why charges travel faster in semiconductor than in metallic conductor. Assume that the dimensions and current are the same. " Homework Equations I=nAve I know I = current, n = number density, A= cross sectional area v= drift...

Homework Statement What is a point charge? and what is the purpose of it when the definition of coulomb's law says,"force b/w TWO POINT CHARGES is directly proportional to their magnitude,and inverse to the square of their distance..."...I mean what is the use of it,why only point charges...

Two infinite-plane non-conducting, thin sheets of uniform surface charge p1 = 12.30 uC/m2 and p2 = -3.30 uC/m2) are parallel to each other and d = 0.615 m apart. What is the electric field between the sheets? (Note: the field is positive if it is parallel to the vector x). Hi, I've tried this...

Hello. This isn't a homework, but rather my own self-study of a textbook (Franklin's Classical Electromagnetism), so if this is an inappropriate place for these types of questions let me know. Homework Statement Four equal charges q are placed at the vertices of a square of side L. What is...

Homework Statement What would the electric field lines / equipotential lines look like between point charges that are set up with potentials of 20 volts and 30 volts versus point charges that are set up with potentials of 0 volts and 10 volts? The Attempt at a Solution At first I thought the...

Homework Statement A particle of charge Q is fixed at the origin of an xy coordinate system. At t = 0 a particle (m = 0.671 g, q = 5.90 µC is located on the x-axis at x = 15.6 cm, moving with a speed of 54.4 m/s in the positive y direction. For what value of Q (in μC) will the moving particle...

In a battery, why is the negative terminal at a lower potential than the positive terminal? And can we define absolute potential of a point? Potential means that the work done in bringing a charge from a given point to a given point on presence of the electric field created by another charge in...

Four charges of magnitude +q are placed at the corners of a square whose sides have a length d. What is the magnitude if the total force exerted by the four charges on a charge Q located a distance b along a line perpendicular to the plane of the square and equidistant from the four charges...

Is it the absence and presence of an electrical fluid called as positive and negative charges?

Homework Statement Two charged particles connected by a string exert electric forces on one another. One has a mass of 3 grams and the other 6 grams. The string is .04m. The force is calculated to be 50.56N. What is the tension in the string? What is the total energy of the system...

Hi, I'm trying to use image charges to find the force that apply on the following particle (on the attachment) , but it seems that I do something wrong - F=2q^2/(2a^2)-2cos(60)q^2/a^2 The gray section have 0 potential, so I've tried to put image charges like it is in the second attachment...

I saw this section somewhere in the forum: Picture 2 plates charged to a voltage V, w/ capacitance C. Of course Q = C*V. An electron is placed in between the plates & released, & it moves towards the positive plate. Said electron with its negative charge now adds to the positive charge...

Homework Statement Two point charges are located on the x-axis, q1 = -e at x = 0 and q2=+e at x=a.(a)Find the work that must be done by an external force to bring a third point charge q3 = +e from infinity to x = 2a. (b) Find the total potential energy of the system of three charges.The Attempt...

Homework Statement A point charge q is placed at a distance ##r## from the centre O of a uncharged spherical shell of inner radius ##R## and outer radius ##2R##. The distance ##r<R##. Find the electric potential at the centre of shell.Homework Equations The Attempt at a Solution The charges...

I have a request for some explanation in Feynman diagram concerning repelling/attraction of electrical charges. I have been told that when two charges (say, e1(-) and the e2(-)) repel each other, a photon is being emitted from one of them, and the other charge is later being hit by this photon...

Homework Statement Find the magnetic forces acting on each electron in the attached image Homework Equations B = \frac{μ0}{4pi}*q*\frac{v x \hat{r}}{r^{2}} F_{m} = qv x B The Attempt at a Solution B_{1} = 10^{-7} * 1.6*10^{-19} *...

So we know that an accellerating charge will emit EM waves. Consider putting a voltage through a circular wire. Electrons are traveling in the wire with constant speed but their velocity is changing constantly as it is changing direction due to the shape of the wire. Now does that mean the...

Homework Statement Four capacitors are connected as shown and connected to a battery to maintain a constant potential difference between points a and b. A charge Q2 = 61.6 μC is measured on capacitor 2. What is the charge on capacitor C3? Homework Equations Q = CV; rules for...

Homework Statement An arbitrarily-shaped object is given a charge q and is then surrounded by a dielectric of permittivity ε as shown in the figure below Find the charges induced in the inner and outer surface of the dielectric. Homework Equations I'm not sure but Gauss's law may...

A charge Q is kept at a distance x from one of the plates of a parallel capacitor having plates d distance apart with cross section area A.The whole system is earthed.Find the value of induced charges on both the plates. I tried putting the sum of induced charges equal to Q and balancing...

and positive when they repel? It doesn't make any sense to me at all. To what are they referring to? The way I see it, if you're got... +...- The closer they are, the less electrical potential energy they have. So it should still be positive. And if you've got two like charges C...C The...

Hello A neutral charged object can be attracted to a charged body due to electrostatic induction.A charged body will induce charges of opposite polarity in the neutral body ,hence causing attraction. But is it possible that two bodies having same sign charges ,say two positive bodies...

Hello I am having a doubt regarding capacitors .I know that when two neutral plates of an uncharged capacitor of capacitance C are connected to a battery of V volts then charges present on the inner surface of the plates are equal and opposite i.e +Q and -Q,where Q=CV . But what will...

Hi all, Lets consider the situation illustrated in the attached figure. A permanent surface charge density \sigma is embedded in between the two metallic electrodes of a capacitor. \sigma is located at distances d1 and d2 from the bottom and top electrodes, respectively. \sigma induces a...

Homework Statement Two equal positive charges Q are fixed on the x-axis, one at +a and the other at -a. (a) The electric field E at the Origin O (b) The electric potential V at the origin O Homework Equations E=-dV/dr --> V=kQ/rThe Attempt at a Solution VNet = V0 + V1 I got V0 = -kQ/r...

Since I was first introduced to chemistry, it's been because "it has two more than eight, and it wants eight to be "happy" so it loses two electrons and gains a positive two charge." It's good enough for me to write on tests, but 'happy' isn't exactly a scientifically accurate term. And why...

Homework Statement Homework Equations The Attempt at a Solution I've managed to do the first parts up till part (a) and part (b), where I have some questions: 2. how do you know where the E-field is zero? Is it in the region of space where there's some sort of special...

Homework Statement Charge A and charge B are 2.2m apart.Charge A is 1.0C, and charge B is 2.0c. Charge C, which is 2.0C, is located between them and is in electrostatic equilibrium. How far from charge A is charge C. Homework Equations E = KcQ1Q2/r^2-------Electric force Formula where E...

Homework Statement Question is attached. I know there's a few ways to solve this, but I'm wondering specifically why my integral of F ds isn't working. Homework Equations F = k * q^2 / r^2 U = ∫ F ds cos 30 = √3/2 s= rcos30 The Attempt at a Solution U = 2 * cos 30 * k *...

Homework Statement Consider a charged particle moving with velocity v through a magnetic field B. Answer True or False. 1) The magnetic field B is always perpendicular to the acceleration a of the particle. 2) The magnetic force F is always perpendicular to the acceleration a of the...

Two point charges, one measuring +5μC and the other -6μC are placed .02m apart. What is the force between the two charges? Which point charge exerts the greater force on the other? Is it an attracting or repelling force? 1μC= 1x 10 to the negative sixthC

When a charge is placed next to an uncharged conductor, a mirrored image of that charge is created on the other side of the uncharged conductor. The mirrored image charge will have an equal and opposite magnitude to the original charge. For example, if there was a 1C point charge 1m away from...

Homework Statement What is the net force on the bottom charge? Please give the force in Fx and Fy Homework Equations F=qE E=kq/r^2 The Attempt at a Solution Fx=2.88x10^-9N Fy=-1.01x10^-4N These aren't correct. I used the equation above and used r=0.035m for both the side...

Homework Statement 2 questions regarding the answer I have been given for this problem. Attachments are the problem & relevant worked answer I disagree with. Problem Three charges are arranged in the xy-plane as shown in attachment. A charge Q is at the point A with (x, y) coordinates...

Homework Statement Two point charges Q1 = -58.6 mC and Q2 = +35.4 mC are located so that Q1 is directly above Q2. The coordinates of Q1 is (-12.0 cm, +15.6 cm). The two charges are 42.8 cm apart. Determine the coordinates of the location where the net electric field due to Q1 and Q2 is zero...

Homework Statement The Electric field lines in an X-Y plane are given in the attached image. The field is defined as E=αi(vector)y at x=0 and x=some distance along the positive X axis. α is a positive constant. Test for charges in the X-Y plane Homework Equations N/A The Attempt...

Homework Statement See images Homework Equations See images The Attempt at a Solution I have tried parts C and D several times, and the homework program is telling me that it's still not correct. For C, I keep getting: 7.7x10^8 N/C for D I keep getting: 7.1x10^-12 N/C...

Roughly sketch the path of each charge if they are released from rest at the same time, and are allowed to move freely. Here is my sketch : The model answer: Please tell me what is wrong with my sketch. Once R moves to the left side, PR and QR will be shorter than PQ. Attractive...

Homework Statement 13 equal charges q are placed at the corners of a polygon and as on a clockface, what is the net force on a test charge at the center Q? I assume the charge at the center is positive and the charge on the polygon so they repel Homework Equations (1/4piEo)(qQ/r^2) The...