Charges Definition and 1000 Threads

Homework Statement Two equal and positive point charges Q1 and Q2 are a distance d from each other on the x-axis. Find the electric potential at the point P which lies a distance z on the z-axis from their centre. Then find the Electric field at the point, and then find the force F on a...

Homework Statement In the figure below the charge in the middle is Q = -3.7 nC. For what charge q1 will charge q2 be in static equilibrium? Homework Equations F = (K*q1*q2)/(r^2)The Attempt at a Solution I'm not sure where to go after acknowledging that Fq1->q = -Fq2->q

Can someone explain how you can have a zero electric potential between opposite charges? a charge would move there. I thought electric potential was the measure of energy per charge. wouldn't a 0 electric potential imply that a test charge cannot have any potential energy at this point? how is...

Hi one quick question about the electric field of a conducting sheet of charges. When you given a horizontal sheet of conductor with uniform distributed charge on its surface,will there be any electric field on the top AND on the bottom of the sheet? How is that different from a...

Homework Statement Suppose in the figure (Figure 1), that C1 = C2 = C3 = 18.0μF and C4 = 28.2μF. If the charge on C2 is Q2 = 37.4μC, determine the charge on each of the other capacitors Determine the voltage across each capacitor. Determine the Voltage Vab across the entire...

Homework Statement A, B and C have charges of -2.6, 8.5, and 7.5 microC respectively. These charges are at the points 2.5, 7 and 2 on a straight line where all distances are measured in millimeters from the zero point. What force does a -7.5 microC charge feel if it is at the point 1.2 mm...

Homework Statement There is a charge Q=1 μC located at x=0 and a charge -Q/2 located at x=4 m. What is the E-field. At what value of x is the E-field zero? Express your answer in meters and do not approximate decimals digits. Homework Equations E=\frac{q_1 q_2 k_c}{r^2} Removing...

Homework Statement A square of side s has a point charge at each corner. They all have the same charge +q, but different masses, m1, m2, m3, and m4, respectively. Initially, all of the charges are held at rest until they are released. Of course, they would repel each other and move away from...

Homework Statement Three charges, each of magnitude 2 nC, are at separate corners of a square of edge length 1 cm. The two charges at opposite corners are positive, and the other charge is negative. Find the force exerted by these charges on a fourth charge q = +3 nC at the remaining (upper...

My days in high school are almost at an end and I don't want to run to my teachers with this question. So can someone please explain this to me: why an accelerated charge emits photons and loses energy? Links and references are also welcome. Thanks in advance.

Does any moving charge generate a magnetic moment? I thought so because a moving charge generates a magnetic field.

Homework Statement http://loncapa.vcu.edu/res/vcu/phys202/zzImages/two-charges-forces.bmp Problem#1: Two identical conducting balls, A and B, of identical masses m = 10 kg, are suspended in equilibrium by insulating massless strings in length L = 3 m. Both balls make the same angle θ = 30°...

I am given 4 potential charges, 1V, 3V, -6V, and 5V, all arranged randomly around each other. There is a test charge located at infinity. No distances are given between the potentials.1. Where will a test charge of 2*10^-6 C travel? 2. What is its kinetic energy? 3. Find the capatinance of a...

"A charged sphere is a distance d from the centre of an earthed sphere conducting sphere of radius a. An image charge (q') for this system is located at a distance b from the centre of the sphere where: q'= -(aq/d) and b=(a^2)/d Calculate the expression for the Electric field at point p...

I was doing some homework problems, and I came across a couple I didn't know. I then realized I must have screwed up my understanding on electrical forces. For an electrical force, if there are two protons, the force is k*q1*q2/r^2. The direction is in the opposite direction. <---(+)...

Homework Statement You have two identical tiny conducting spheres: sphere A carries positive charge qA, and sphere B carries negative charge qB. First the spheres are placed distance d = 0.404 m apart, and they attract each other with a force F1 = 0.748 N. Then the spheres are brought...

Homework Statement Two point charges q1 and q2 are held 4.00cm apart. An electron released at a point that is equidistant from both charges, undergoes an initial acceleration of 8.05×1018m/s2 directly upward in the figure, parallel to the line connecting q1 and q2. Homework Equations...

I am trying to do an exercise but there's no equation in the book that links speed and charges. Can anyone help? This is the exercise: Homework Statement There is a particle with mass = 20 grams and charge = 6 x 10^(-6) C, and another particle with mass = 50 grams and charge = -4 x 10^(-6) C...

Homework Statement Two charges, Q1 = 4*10-8 and Q2 = 2.7*10-8 are 3.25 m apart. What is the electric field magnitude halfway between them? Homework Equations E = kQ/r2 The Attempt at a Solution E1= k (4*10-8C)/(1.63m)2 = 135 N/C E2= k (2.7*10-8C)/(1.63m)2 = 91.4 N/C 135 N/C - 91.4 N/C = 43.5...

Why does a magnetic field produce a force on a moving charge? I would love if someone answered why and not how.

Homework Statement A positive point charge (q = +8.9 10-8 C) is surrounded by an equipotential surface A, which has a radius of rA = 1.3 m. A positive test charge (q0 = +2.7 10-11 C) moves from surface A to another equipotential surface B, which has a radius rB. The work done by the electric...

Homework Statement How to find the potential between two positive point charges? I don't know where I'm going wrong. ==I am adding V_1 and V_2. converted mC to C, cm to m, correct value of k. V1= kq1 / r1 v2= kq2/ r2. ==I am adding both of these, but I'm not getting...

This problem has been posted before with different values for each variable and I did as best I could to complete it similarly. However, when I attempt to input my final answer I get it wrong every time. I just wanted to see where I am going wrong, thanks. Homework Statement Coulomb's law...

Homework Statement How to find equilibrium points between four point charges? How do you determine whether these equilibrium points are stable, unstable, or neutral? I know the sum of the forces should equal zero, but that's it. How do you determine the stability of the equilibrium...

I'm new to forums and after I typed all this out and tried to submit, it cleared everything. I really need to get this problem finished tonight. Homework Statement You have two charges (q1 = -15uC and q2 = 3uC) separated by a distance (d = 3m). We want to calculate the electric field, E...

Homework Statement The three charges shown below (Q1=22.6*10^-6C, Q2=22.6*10^-6C, Q3=61.0*10^-6C) are at the corners of an iscoceles triangle with sides a=4 m and b=2 m. Q3 is 2m from Q1 and Q2, Q1 is 4m from Q2. In other words, Q3 is the point charge at the "tip" of the isosceles...

Greetings fellow physics adorers/ mathematicians, I was wondering if someone could help me with my posted problem. All the necessary details from the template are included in the screenshot on the right.

Homework Statement Three charges, q1 = 8.43nC, q2 = -4.29nC and q3 = 3.00nC are at the corners of an equilateral triangle, as shown in the figure below. A. The angle alpha is 60.0° and L = 0.448 m. We are interested in the point midway between the charges q1 and q2 on the x axis. For...

1.Two point charges, Q1 = -22 mμ C and Q2 = 51mμ C , are separated by a distance of 12 cm. The electric field at the point P is zero. How far is Q1 from P?...Sorry if my equations arent coming out right on the screen this is the first time I've posted on the forum, if you look at the thumbnail...

Homework Statement I have a problem as follows: "Two charges of identical mass hang from the same point by a thread of length l. One has charge q and the other has charge 2q. Find the angle each mass makes with the vertical." Now, I got an answer and found that each mass will make the...

1. Homework Statement Three small identical metal spheres carry electric charges, +Q, +2Q, and +3Q. The centres of the spheres lie in a straight line at fixed positions R, S and T, such that the distance between the spheres at R and S is d1 and that between the spheres at S and T is d2. Assume...

Homework Statement Line A extends from (2,2, 0) to (-2, 2, 0) and line B extends from (2, -2, 0) to (-2, -2, 0). Each has a linear charge density ρl = 1 nC / m. You want to calculate the magnitude and direction of the electric field due to the two line charges for all points on the z-axis. a.)...

I don't even know why I am having trouble with this problem. Homework Statement Two protons are initially an infinite distance apart. One of the protons is initially at rest, and the other is approaching the other at a certain speed. What kinetic energy must the other proton have so that their...

My brain has been shocked by this problem dealing with charges and Coulombs law :( This is what I did... F = k*q1*q2/r^2 F = [ (8.99 * 10^9)(4.9 * 10-9)(6.0 * 10^-9) ] / (0.295)^2 F = 0.000000264 / 0.087025 F = 0.0000003034 F = 3.034 * 10^-7 N F = k*q1*q3/r^2 F = [ (8.99 *...

Homework Statement The diagram shows two charges, +4 μC and –16 μC, 120 mm apart. What is the distance from the +4 μC charge to the point between the two charges where the resultant electric potential is zero? A 24mm B 40mm C 80mm D 96mm Homework Equations potential equation...

Homework Statement Point charges of -7 µC, 1.0 µC, and +7 µC are located along the x-axis at x = -1.0 cm, x = 0, and x = +1.0 cm, respectively. Locate a point on the positive x-axis where the magnitude of the electric field is zero. Homework Equations E=(kQ)/r^2 E(total)=E(1)+E(2)+E(3)...

Homework Statement Q .1 The plates of a parallel plate capacitor are given equal positive charges. What will be the potential difference between the plates? What will be the charges on the facing surfaces and on the outer surfaces? Q.2 Each plate of a parallel plate capacitor has a...

I came across this piece of news, about how researchers have found a way to repel electric charges away from a surface: http://phys.org/news/2013-01-metal-surface-repel-electric.html I was thinking that perhaps it could be useful for more than just particle accelerator experiments. Could...

Homework Statement This isn't a problem from a textbook, but it is homework. For a lab in class, we worked with simple RC circuits on breadboards. The strange thing I noticed is that the capacitor always charges faster than it discharges. I know that the Time constant should be T=RC, so I...

Homework Statement Two fixed charges, +1.07 uC and -3.28 uC, are 61.8 cm apart. Where may a third charge be located so that no net force acts on it? Homework Equations Coulombs law The Attempt at a Solution q1 = 1.07 uC q2 = -3.28 uC q3 = q q1 ----- q2 ----- q q1 and q2...

In Griffiths, for deriving the bound charges for a given polarization P , the formula used is the general formula for dipoles .i.e ( equation 4.9) {Here the potential at r is calculated due to the dipole at r' ) V(r) = ∫\frac{x.P(r')}{X^2}d\tau' Here X = r - r' , and x = unit vector in...

Two spheres S1 and S2 hang from light insulating strings of the same length from points P1 and P2 which are on the same level. S1 is of mass M and has charge Q. S2 is of mass M and has charge 2Q. Repulsion between S1 and S2 causes their strings to be inclined at angles of theta1 and theta2 to...

Homework Statement Two +4 mC charges and two -4mC charges are arranged on a circle of diameter "d" as shown in the figure below. The magnitude and direction of the force on the +4mC charge at the top of the circle is: a) 6.39*10^6 N radially inward b) 1.2 * 10^7 N radially inward c) 2.4...

Homework Statement Two point charges with charges of +5μC and -100μC are separated by 15 cm. The magnitude of the force between these charges is: a) 1.99 N b) 4.02 N c) 20 N d) 199 N e) 400 N Homework Equations F = q1q2 * k / r^2 The Attempt at a Solution F =...

Homework Statement A charge +Q exists at a point and directly west of this point a charge -Q exists. What is the direction of the net electric field at the midway point? I'm studying old finals for my exam and this question keeps popping up in various forms. The answer is always directed...

Homework Statement Two charges with e+ and e- charge are separated a distance "a" apart. Assuming there's no gravity, how long does it take for the charges to collide? Homework Equations My professor said to use conservation. I'm guessing he means Wnc = (KE + PE) - (KEo + PEo) The...

Hello, please help me solve this so I can learn from it. Image: http://i48.tinypic.com/30k8y10.jpg Two charges with charge +Q are placed at A and C vertices of a rhombus with four even sides (α). A prticle with mass m and charge -Q is placed at vertex B. An unknown charge size of q is...

Homework Statement (see attachment) Homework Equations The Attempt at a Solution I think i need to use method of image charges here but if i do that, i need to place infinite fictitious charges and finding the electric field at the surface of any of the plate would be very...

I've been trying to understand what happens on a microscopic level - in terms of charges and EM fields - in a simple circuit (say a battery with wires to a lightbulb), and I'm finding it pretty difficult. I read these articles that try to untangle the flow of charge from the flow of energy, and...

Hi.I want to know why we multiply the separate charges in the coulomb equation.I understand that the force is proportional to the charges, but I don't understand why we multiply charges.Why just we don't add them together.Are there any theoretical explanation for this.The same goes for the...