Electric potential Definition and 1000 Threads

is electric potential conservative? is it correct?

Homework Statement A -2.0 nC charge and a +2.0 nC charge are located on the x-axis at x= -1.0 cm and x = 1.0 cm, respectively. At what position or positions on the x-axis is the electric potential 0? Homework Equations V = kq/r The Attempt at a Solution I'm having difficulty...

Homework Statement There are four points. The electric potential difference between points 1 and 2 (V12) is 30V, the electric potential difference between points 2 and three (V23) is 50 V, and the electric potential difference between points 4 and 1 (V41) is 60 V. What is the electric...

Hi Ok so i came across this question which asks you to find the force on electrons in a wire which is moving in a magnetic field, hence the opposite to the direction of the current. I worked out using The right hand rule that the current would be going from point P to Q, which was write...

Homework Statement What is the difference in electric potential between a point midway between the charges and a point 0.05 meters away from the positive charge but along the line between the charges? Homework Equations UE = K * (Q1*Q2)/r The Attempt at a Solution K = 9.0x109Nm2/C2 UE =...

Hi I am sure this is very basic but i am struggling to derive or work this out, and i have looked, on the internet and textbooks and can't find this. The electric potential at a point is defined as the work done per unit charge to move a small test charge from infinity to that point...

Electric Potential Energy Among Multiple Charges kinda aurgent [b]1. Homework Statement Four point charges, fixed in place, form a square with side length d. (See image) http://i23.photobucket.com/albums/b354/h4llw4x0r/notSoFast.jpg The particle with charge q is now released and given...

Hi =D I know that the electric potential in any given point (considering only a point charge) in a region is defined to be: \varphi = \frac{q}{4\pi \varepsilon_{0} d} I know too that the electric potential generally can be defined as: \varphi = - \int_{P1}^{P2} \overrightarrow{E}...

When I hold voltmeter contacts in my hands, (one in each) the meter reads about .2V I know it isn't that significant, but what could be the explanation for this? Are we charged? Why would there be potential between my left and right hand? Or is it just a fluke from rubbing my socks on the...

We say that if pint A is at a higher potential than point B, A is at positive potential and B is at negative potential. Does it necessarily follow that a point at positive potential is positively charged, or that a point at negative potential is negatively charged? Why?

Homework Statement I'm confused about the correlation between electric potential and electric field. Does a high electric potential mean the electric field is also high? Homework Equations E=-(dV/dx, dV/dy, dV/dz) and V(x)=V0 - E x The Attempt at a Solution I think not...

[PLAIN]http://img526.imageshack.us/img526/5079/29693720.jpg im struggling to start this question do i calculate all of the potentials seperatly and add them up? and to calculate the potential on the circle and 1/4 circle would i just use 2pi r ? and for the 1/4 cirlce definite intergrate it...

my teacher gave me a handout that said Vab = Vb- Va However my textbook says Vab = Va-Vb.. Which one is correct? By the way Va means voltage at a and Vb equals voltage at b

Homework Statement An electrically neutral conducting sphere of inner radius Ra and outer radius Rb is centered on the origin. Two equal, positive point charges of magnitude Q are located on the x-axis on each side a distance d from the origin. Determine the electrical potential in the...

Homework Statement Point P is at the origin. Charge A is at (-3,0) and Charge B is at (4,0). What is the electric potential at point P. Let's assume they are both positive charges for now, but I am interested to know if and how it changes if either/both of the charges are negative...

how would you solve this problem? A charge q1 = 3.40 nC is placed at the origin. Three identical charges, q2, q3 q4, are placed at the positions (0.100 m, 0 m), (0 m, 0.100 m), and (0.100 m, 0.100 m). What is the potential energy of this configuration of charges? should you do answer =...

A proton's speed as it passes point A is 53,000 m/s. It follows the trajectory shown in the figure below, in which V1 = 15 V and V3 = 5 V. What is the proton's speed at point B? Figure: http://www.webassign.net/knight/p29-44alt.gif Homework Statement Mass of proton: 1.67e-27 Charge of...

Homework Statement Consider a model semiconductor with a bandgap of 1.0 eV which is doped with 10^17 /cm^3 acceptors for x<0 and 10^17 /cm^3 donors for x>0. E_c - mu = 0.1 eV on the far left and on the far right (far from x=0) Homework Equations The Attempt at a Solution...

1. Two point charges 2.0cm apart have an electric potential energy -180 microjoules. The total charge is 30 nanocoulombs. What are the two charges? Givens: change in postition = 0.02m , Q = 30nC = 3.0e-8C, V = -180 microjoules = 1.8e-4 Homework Equations F = kq1q2/r^2 E = kq/r^2 The...

ok, the electric field E = - dV / dx, where V is the potential. but what is exactly is x? because i am quite confused by E and V why is it that the electric field E is = 0 IN a conducting charged sphere of radius R, AND V = k (q/R) , WHEREAS, the electric field E is = 0 IN a long...

Homework Statement The wire in the following figure has linear charge density \lambda. What is the electric potential at the center of the semicircle? Homework Equations The Attempt at a Solution I can see a lot of integration going on here, but i am having trouble the setup the...

Homework Statement The figure shows a thin plastic rod of length L = 11.8 cm and uniform positive charge Q = 58.9 fC lying on an x axis. With V = 0 at infinity, find the electric potential at point P1 on the axis, at distance d = 3.45 cm from one end of the rod...

Homework Statement Consider charges placed at the corners of a rectangle. This rectangle is a horizontal rectangle and is .43 m long and .25 m wide. At the upper right corner there is a charge of 7.0 µC. At the bottom right there is a charge of -14 µC. At the bottom left there is a charge of...

A plastic rod with a total charge Q uniformly distributed along its length is bent into a regular hexagon where each side has a length of 2a, as shown below. Calculate the electric potential at the center of the hexagon (relative to the point at infinity). I wasn't sure how to exactly start...

can anybody help me with the following question: the electric potential everwhere in xy plane is given by V = 36/ ((x+1)^2 +y^2)^ 1/2 - 45/(x^2 +(y-2)^2)^ 1/2 where V is in volts and x,y in meters. Determine the position and charge on each of the particles that create this potential

Homework Statement Figure 1 shows a pair of parallel metal plates, A and B, fixed vertically 20mm apart with a potential difference of 1500V between them. (a)(i) Draw the electric field lines in the space between the plates and calculate the electric field strength at point P. (a)(ii)Sketch...

Homework Statement A proton moves along the x-axis, where an arrangement of source charges has created the electric potential V=6000x^2, where V is in volts and x is in meters. (a) Graph the potential between x = -5.0 and x = +5.0. (c) By exploiting the analogy with the potential energy of a...

Homework Statement In the circuit given (attached) , point S is earthed , what are the electrical potentials at point P , Q and R . Homework Equations Kirchoff's second law . The Attempt at a Solution The electric potential at point S is 0 . By applying Kirchoff's second law ...

Homework Statement I'm quite lost here. The problem states: A spherically symmetric electrostatic charge distribution produces an electric field that is directed radially out from the distribution center. At the distance r from this center the field has the strength: \[E=\frac{Q}{4\pi...

Homework Statement Two small metal spheres, each of mass m, are attached to the lower ends of two long insulated strings of negligible mass as shown. Each string is length, l. The spheres are pulled apart until each string makes an angle "theta" with the horizontal. A charge of +q is placed...

A charged particle (either proton or electron) is moving rightward between 2 parallel charged plates separated by distance d = 2mm. The plate potentials are V1 = -70.0 V and V2 = -50.0 V. The particle is slowing from an initial speed of 90.0 km/s at the left plate. a) Is the particle an electron...

Homework Statement Three charges are arranged as shown. Find electric potential energy at reference point (the one that's circled) How much work would it take to bring in a charge of 1.25 µC from infinity to that point? Homework Equations V=kQ/r Eel=QV The Attempt at a...

Homework Statement Points A and B have electric potentials of 350 V and 160 V, respectively. When an electron released from rest at point A arrives at point C, its kinetic energy is KA. When the electron is released from rest at point B, however, its kinetic energy when it reaches point C...

hi, in the formula ChangeInPotential = Current X Resistance (formula for change in potential across a resistor) , if the resistor has two ends (point A and point B), how do I know wether it is the change in potential from point A to point B or from point B to point A

http://img188.imageshack.us/img188/2231/p1040967s.jpg (for the above grah, the plate is inseted in the middle) http://img683.imageshack.us/img683/7662/p1040968s.jpg (for the above grah, the plate is inseted in the middle) http://img11.imageshack.us/img11/7476/conductor1.jpg...

http://img519.imageshack.us/img519/3416/32ex28.jpg What is the voltage at points a,b,c,d? I don't know how this works with Kirchoff's loop law. Any help?

Homework Statement Consider a solid conducting sphere with an inner radius R1 surrounded by a concentric thick conducting spherical shell which has an inner radius R2 and outer radius R3. There is a charge Q on the sphere and no net charge on the shell. For all parts of this problem, we adopt...

My textbook says that electrons in a wire begin with electric potential energy- they are then accelerated by the electric field and their potential is converted to kinetic. Once inside a resistor, they collide with molecules and their kinetic energy is converted to thermal energy. However, it...

Two insulating spheres have radii 0.3cm and 0.5cm, masses 0.1kg and 0.7kg and uniformly distributed charges of -2 \muC and 3 \muC. they are released when the distance from their center are 1m apart. How fast will each be moving when they collide. Firstly, what is the radius of the sphere use...

Homework Statement What is the electric potential at the point indicated with the dot in the figure? The dot is in the center of an equilateral triangle with sides of 3 cm. The top point is a +2 uC charge and the bottom points are both -1 uC charges. Homework Equations V= kq/r The...

Homework Statement At what distance from a carbon nucleus is the electric potential 2.1 V? Carbon atoms have 6 electrons in the atomic shell. Homework Equations v= K Q / r^2 OR K Q / r (NOT SURE) The Attempt at a Solution use voltage potential for point charge Using either v= K Q / r^2...

Homework Statement A spherical distribution of charge is characterized by a constant charge density \rho for r<= R. For radii greater than R, the charge density is zero. Find the potential \varphi (r) by integrating Poisson's equation. Homework Equations...

Homework Statement The gap in the spark plug of the car is 0.1 cm. What potential difference is needed to produce a spark given that the breakdown strength of air is 3X10^6 V/m. Homework Equations The Attempt at a Solution I'm sort of confused by what they're asking...like i tried...

Homework Statement Derive an expression for p.d , V between point X and point Y in an electric field due to a single point charge +Q as shown in the figure attached . Homework Equations The Attempt at a Solution Vxy=Vy-Vx =\frac{Q}{4\pi\epsilon_o r_y}-\frac{Q}{4\pi\epsilon_o...

Homework Statement What is the difference between an electric field and electric potential? Homework Equations Electric Field = E = Kq/r2 Electric Potential = V = Kq/r The Attempt at a Solution From the equations, I can see that the electric field strength decreases as an...

Homework Statement There are three nonconducting arcs of radius R=8.5cm. The carges on these are as follows: q1= 4.52pC, q2= -2q1, q3= 3q1. With V=0 at infinity, what is the net electric potential of the arcs at the common center of curvature? Homework Equations used Vnet=...

Homework Statement a 5 cm radius conducting sphere has a charge density of 2x10^-6 C/m^2 on its surface. Its electric potential, relative to the potential far away is? Homework Equations I used V= K(q/r) The Attempt at a Solution Using the above equation I got 1.12 x 10^4. This...

Electric Potential-- quick question about process Homework Statement An alpha particle with kinetic energy 10 MeV makes a head-on collision with a lead nucleus at rest. What is the distance of closest approach of the two particles? (Assume that the lead nucleus remains stationary and that...

I'm having a little bit of trouble understanding the concept that the potential electrical energy between two opposite charges is negative while between like charges it is positive. Can someone please explain in detail why this is so? Thanks in advance.

If I'm going to apply the superposition principle and say something like V = V_1 + V_2, I need to make sure that my V_1 and V_2 are established with a common zero point for the potential, right? So, for example, one of them can't have been determined taking the zero point of the potential to be...