Point charges Definition and 349 Threads

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...

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...

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 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=...

Homework Statement The four point charges, each of + 3.00 μC, are situated at the corners of a rectangle of length, b = 60.0 cm and width, a = 30.0 cm. Find the magnitude and direction of the force on q2, due to the other charges. Solved this but i needed someone to check it for me because...

Homework Statement i think i may have solved this but I am worried I am wrong because it seemed too simple. I wouldn't bother posting too check except that its for an assignment... the question is in the attachment- can someone please check this! Homework Equations The Attempt at a...

Homework Statement See attachment--please! Homework Equations F=kq1q2/r^2 The Attempt at a Solution I can't see where to start this question, I can do questions where there is three point charges and it asks you to find the net force on one of them and i think that in essence this...

Homework Statement Three equal point charges, each with charge 1.95 nanoC , are placed at the vertices of an equilateral triangle whose sides are of length 0.550m . What is the electric potential energy of the system? (Take as zero the potential energy of the three charges when they are...

Why do we take a point charge always while estimating the electric field intensity of a system of charge? as in Coulomb's and Gauss's Law etc.

Okay, in inertial reference frames, two particles with the same charge will always repel each other. Even if they were moving in parallel at high speeds, and thus producing magnetic fields, special relativity would come in and balance the forces from the electric and magnetic fields so that...

Homework Statement I had this exam question for a final exam and I was wondering if I got it right or not. There are three point charges +4q equally spaced apart at the tips of an equilateral triangle with distance .11m apart from each other. What is the magnitude of the electric field at the...

Homework Statement Two identical positive point charges Q are nailed down a distance 2D apart. Point P is midway between the two charges as shwon in the diagram. A dashed line is vertical i.e. perpendiculat to an imaginary line connecting the two charges a distance D from both charges...

Homework Statement A point charge of +2.0 microC is separated from a second point charge of -0.35 microC by a distance of 4.0 x10-4 m. Calculate the size of the force that each charge exerts on the other and its direction. (Assume 1/4 pi [SIZE="2"]ε0 = 9.0 x109 m F-1) Homework Equations...

Homework Statement A proton has a velocity of 1.0 * 10^2 m/s in the x direction + 2.0*10^2 m/s in the y direction and is located in the z=0 plane at x=3.0m, y=4.0m at some time t=T. Find the magnetic field in z=0 plane at x=2.0m, y=4.0m. Homework Equations magnetic field is given by...

In an equilateral triangle a positive point charge +q is located at each of the vertices. If a 4th charge is added at the midpoint between one of the sides could this charge be such that the force on it would be zero?

Homework Statement Two point charges are placed on the x axis. The first charge, q1= 8.00 , is placed a distance 16.0m from the origin along the positive x axis; the second charge, q2= 6.00 , is placed a distance 9.00m from the origin along the negative x axis. Calculate the...

Homework Statement A point charge q1:-4.00 nC is at the point x=0.600 meters, y=0.800 meters, and a second point charge q2:+6.00 nC is at the point x=600 meters, y=0 . a) Calculate the magnitude of the net electric field at the origin due to these two point charges. Express your answer in...

Edit: Apparently Coulomb's law only holds for electrostatics... in that case I understand that this problem is physically impossible. I'd still like to solve it if we assumed that coulomb's law did hold for moving charges If there are two point charges that are initially separated by...

Homework Statement A charge of q1 = -8.5 μC is at y = 6.0 m, and a charge of q2 = -6 μC is at y = -4.0 m. Locate the point (other than infinity) at which the total electric field is zero.Homework Equations E=k(q/r^2) E1=E2 Quadratic Equation The Attempt at a Solution 9x10^9 (8.5x...

Homework Statement Three equal point charges, each with charge 1.00 microC, are placed at the vertices of an equilateral triangle whose sides are of length 0.200 m. What is the electric potential energy U of the system? (Take as zero the potential energy of the three charges when they are...

I am struggling to grasp the concept of the electric field between two opposite charges. I know that the field is strongest closest to the charge and gets weaker further away from the charge. I also know that the electric field lines go from positive to negative and that they are perpendicular...

Homework Statement http://www.freeimagehosting.net/uploads/3e00ce8695.gif Homework Equations Electric field equation derived from Coloumb's Law (given on the screenshot above). The Attempt at a Solution Solution is given in the form of answer sheet...

Hi first post sorry if I didn't follow anyone specific rule. Me and my fiancee are stumped how my physics 2b teacher got 6kq^2/L^2 for F24. We understand that where r= L square root2/2 is squared so the result is L^2. But where in the heck did the 6 come from in 6kq^2.

[b] 1. The arrangement of charges shown in the figure is called a linear electric quadrupole. The positive charges are located at +-s. Notice that the net charge is zero. Find an expression for the electric potential on the x-axis at distances y>>s. Homework Equations V= \sum1/4pi...

Homework Statement Two point charges lie on the x axis. A charge of -2.5 µC is at the origin, and a charge of +8.5 µC is at x = 10.0 cm. What is the net electrical field at points x = +4 and at x = -4? Homework Equations E = kq/r^2 The Attempt at a Solution For x = +4... E=...

A point particle that has a charge of 15.0 µC is located at x = 0, y = 0 (we'll call it q0 and a point particle that has a charge q is located at x = 12.0 cm, y = 0 (we'll call it q1. The electric force on a point particle that has a charge of 6.0 µC at x = 24.0 cm, y = 0 is -(19.7) N \hat{i}...

Homework Statement A point charge q = 4.9 \mu C is placed at each corner of an equilateral triangle with sides 0.20 m in length. Is the magnitude of the electric field at the center of the triangle greater than, less than, or the same as the magnitude at the midpoint of a side? Explain...

Homework Statement Four point charges are located at the corners of a square with sides of length a. Two of the charges are + q, and two are - q. 1)Find the direction of the net electric force exerted on a charge + Q, located at the center of the square, for the following arrangement of...

Homework Statement Find positions of four charges in a plane (+1C, -1C, +2C, -2C) that result in an equilibrium (zero net force on each charge). Report positions as four (x,y) pairs. Homework Equations F = \frac{k_{e}q_{1}q_{2}}{r^{2}} The Attempt at a Solution I had no idea...

Homework Statement A small sphere carrying a charge of q with mass m is suspended from point A by a massless thread of length L, as shown in the figure. A second sphere carrying a charge of 2q with mass M is suspended from a fixed rod from point B. The distance between A and B is equal to...

This is probably child's play for most of you, but a guy like me struggles to understand basic concepts. A kick in the pants to set me off in the right direction would be greatly appreciated. Homework Statement How far must the point charges q_1 = 7.60 microCoulombs and q_2 = -24.0...

Homework Statement Four charges Aq,Bq,Cq, and Dq (q = 2.50 x 10-07C) sit in a plane at the corners of a square whose sides have length d = 69.5 cm, as shown in the diagram below. A charge, Eq, is placed at the origin at the center of the square. DATA: A = 2, B = 8, C = 5, D = 4, E = -4...

Homework Statement Two identical spheres with mass m are hung from silk thread with length L. Each sphere has the same charge, so q1=q2=q. The radius of each sphere is very small compared to the distance between the two spheres, so they may be treated as point charges. Show that if the angle...

Homework Statement A point charge Q is located at the origin. The point charge produces an electric field at a radius of 2.0 meters from the origin of 20N/c.The electric potential of a spherical surface of radius 3.0 meters around the point charge is, in Volts. Homework Equations...

1. b]1. Homework Statement Two large metal plates are held tightly together. Two equal and opposite point charges are placed one each on either side of the plates, and equidistant from them. The line joining the two charges is perpendicular to the plane pf the plates. What will happen when...

This is probably a product of how I was taught, but I am unsure of the status of conservation of energy in classical EM with point particles. Here is the background: When I was taught in undergrad, general arguments were used to show that there needs to be a back-reaction on a point particle...

This is from Sadiku's Elements of electromagnetics. I have come to a result but it's different from that of the book. Homework Statement Three identical small spheres of mass m are suspended by threads of negligible masses and equal length l from a common point. A charge Q is divided...

Homework Statement A point charge Q is located on the axis of a disk of radius R at a distance b from the plane of the disk (Fig. below left). Show that if one fourth of the electric flux from the charge passes through the disk, then R = sqrt(3)b. PLEASE SEE ATTACHED WORD DOCUMENT FOR...

Homework Statement 3 equal point charges on the vertices of a triangle. If the each of the charges are doubled, why is the resulting force on each charge quadrupled? Homework Equations F= Fx +Fy F= kqk2/r^2 The Attempt at a Solution I got doubled

Homework Statement Three pointcharges are located at the following points on an x-y coordinate system, Q1 = -3 uC at (0,0) q2 = 10.0 uc at (0,0.5m), and q3 = -3 uC at (x,0) . What is the total electric potential at the point (x/2,0) where x is in units of m. At what value does x have to be...

hi ,, I'm having this problem that i tried to solve but I couldn't so if anyone could help with EXPLANATION I would be greatful Homework Statement Four identical point charges (q = +10.0 µC) are located on the corners of a rectangle. The dimensions of the rectangle are L = 60.0 cm and W...

Homework Statement Given two 1.80 µC charges at +/- 0.800 m from the origin and a positive test charge q = 1.30x10-18 C at the origin. What is the electric field at the origin due to the two 1.80 µC charges? What is the electrical potential at the origin due to the two 1.80 µC charges? related...

Homework Statement Homework Equations The Attempt at a Solution First time: I got -1.468e-19 which is wrong. Second time: I got -6.407e-19 which is wrong. q1 = 3.337e-19 ?

Homework Statement 5 point charges; q1; charge = +q distance = d q2; charge = +2q distance = 3d q3; charge = -3q distance = 2d q4; charge = -4q distance = 3d q5; charge = -5q distance = 2d are placed in the vicinity of an insulating spherical shell with a charge (+Q), distributed...

Homework Statement 5 point charges; q1; charge = +q distance = d q2; charge = +2q distance = 3d q3; charge = -3q distance = 2d q4; charge = -4q distance = 3d q5; charge = -5q distance = 2d are placed in the vicinity of an insulating spherical shell with a charge (+Q), distributed...

Homework Statement Two point charges , Qz= +5.00 nanoC and Q2= -3.00 nanoC, are separated by 35.00 cm. a) What is the potential energy of the pair? What is the significance of the algebraic sign? b) what is electrical potential at a point midway between the charges? (here I'm supposing i'd...

Homework Statement Two point charges are placed on the x axis. The first charge, q1 = 8.00 nC, is placed a distance 16.0 m from the origin along the positive x axis; the second charge, q2 = 6.00 nC, is placed a distance 9.00 m from the origin along the negative x axis. Calculate the...

1)What is the formal definition of a point charge? It is known, that coulomb's law , is valid for point charges? But the real world does not consist of point charges. And coulomb himself used two spheres in his experiments... 2)Another point, in many books I have found that they say, when...