Electric potential Definition and 1000 Threads

Homework Statement A small ball has a mass of mass m 4.0 x 10^-8 kg and a charge of q = -2.0 x 10^-5 C. It enters a box with an initial speed of v0 = 1.0 x 10^4 m/s. The point where the charge leaves the box is at a voltage 350 kV higher than the entry point. Homework Equations...

Homework Statement A solid insulating sphere of radius a = 4.3 cm is fixed at the origin of a co-ordinate system as shown. The sphere is uniformly charged with a charge density ρ = -421 μC/m3. Concentric with the sphere is an uncharged spherical conducting shell of inner radius b = 14.6 cm, and...

Homework Statement In a certain region of space, the electric field along the x-axis is given by: E = 1.2x - 3.06, where E is in N/C and x is in meters. If you set the electric potential equal to zero at (4.39 m,0), find the electric potential, in V, at the point (7.22 m,0). Homework...

Homework Statement In a certain region of space, the electric potential along the x-axis is given by: V = 111x3 - 517x - 258 where V is in Volts and x is in meters. Find the force F (magnitude in N and direction) felt by a -444 μC point charge at point (56.5 cm,0). (For direction, all you...

Homework Statement Positive point charge (Q = 8 μC, mass m = 19 g) is fixed at point (9 cm,0). A second identical charge q is constrained to slide on a frictionless wire along the y-axis. Assume: the only force on q is the electrostatic force. If q starts at (0,7 cm) and is released from...

Homework Statement I've attached a url with a picture of the problem setup and diagram https://instagram.com/p/7nYNXTscre/ Homework Equations I used the equation V = KΣiqi/ri to solve for potential at A and B The Attempt at a Solution For Va I used K((Q/d)+ (2Q/(d^2+d^2)^.5)) I just plugged...

Homework Statement The question is attached. Homework Equations V = kq/r The Attempt at a Solution The analogy to determining the electric potential by thinking of it as lifting a rock (the more distance the higher the potential) makes sense to me, but I am confused by this equation: kq/r...

Homework Statement I need to solve a problem like Jackson 3.18. I need to find potential due to the same configuration but the position of two plates is opposite i.e. Plate at Z=0 contains disc with potential V and plate at Z=0 is grounded. Homework EquationsThe Attempt at a Solution I think...

Homework Statement Find the electric potential of a ring of radius R that is charged uniformly with a linear charge density λ. Homework EquationsThe Attempt at a Solution I wasn't sure which section to post this in but I finally landed here. It isn't really a problem that I'm troubled solving...

Homework Statement Given a spherical shell of radius R and the surface charge density ( being the angle from the top of the sphere and being a constant) find the electric potential and the electric field inside and outside the sphere. Check that both the potential is continuous inside and...

Homework Statement An electron moves from a point in space where the potential is 100 V to another point where the potential is 200 V. If it started from rest, what is its speed at the end of the trip? Homework Equations I'm not sure what's relevant and what's irrelevant at this point. The...

Hello, In a battery or a galvanic cell, the electric potential of the battery is due to a difference of charges between the two cells like in a capacitor? if yes, why we call it electromotive force of a battery (EMF) ? Thank you.

Homework Statement Hi, I am stuck with this homework. I have been asked to make an equation out of a diagram for V(z) using V=kQ/r equation, where z is a positive axis centred with four negative charges. Here is the diagram. 2. Relevant equation E=F/q F of point charge: F=kQq/r^2 E=kQ/r^2...

Homework Statement Two point charges are placed on a horizontal line, the first is +3.0-μC located at x = 0.0-m, y = 0.0-m and the second is -4.0-μC located at x = 2.0-m, y = 0.0-m. At what points on the horizontal line y = 0.0 will the electric potential be zero? Homework Equations V(r)=kq/r...

Homework Statement Find potential of a uniformly charged rod of length 2a Homework Equations -Superposition The Attempt at a Solution dV=\frac{kλdx}{r}, r=x V=λk\int\limits_{-a}^a \frac{1}{x}\mathrm dx=0 Potential at point B is zero. Is this correct?

Homework Statement Describe the motion of a test charge in a non-uniform electric field.By considering the electric forces acting and Newton’s second law, explain the type of motion occurring in a non-uniform electric field. Homework EquationsThe Attempt at a Solution I wrote that the...

Homework Statement There are 12 electrons spread on the circumference of a circle with radius R evenly. What's the electric potential at the centre? Then the electrons are concentrated on the upper half of the circle, spread evenly. What's the electric potential at the centre now? Homework...

Homework Statement A charged particle (q = -8.0 mC), which moves in a region where the only force acting on the particle is an electric force, is released from rest at point A. At point B the kinetic energy of the particle is equal to 4.8 J. What is the electric potential difference...

Homework Statement If 3000V is applied to the teltron tube with EHT voltage, what would be the potential difference between the parallel plates in the teltron tube? Homework EquationsThe Attempt at a Solution Since one end of the plate is positive, the other end is negative, 3000V-(-3000V)=6000V

Homework Statement Homework Equations V=IR W=VQ The Attempt at a Solution The answer is B, though I thought that electric potential difference is the ratio of energy to charge? Why is the answer stating the ratio of energy to current instead?

Homework Statement The question asks: Where is the electric potential 0? Homework Equations I believe the relevant equations are v=1/(4*pi*epsilon) (Q/r) or v=-Ed The Attempt at a Solution I think that the electric potential is 0 when the electric field is zero as well. However, I am not quite...

what is electric potential?and what is the difference between electric potential and potential difference?

I'm unsure if the following is true or not in the absence of external forces: Electric potential is a scalar quantity. This I know is true because there is no direction associated with potential energy. It is always possible to assign a value of zero to the electric potential at the...

Homework Statement A large hollow metallic sphere A is charged positively to a potential of 100 V and a small sphere B to a potential of 50 V. Now B is placed inside A and they are connected by a wire. In which direction will the charge flow? Homework EquationsThe Attempt at a Solution A is at...

Homework Statement An electric charge q1 (-6e) is located at the origin. A second electric charge q2 (+2e) is located a distance "d" from the origin. In terms of "d", what is the distance "x" from q1 where the net electric potential is zero? Assume for this problem that x<d.2.Relevant equations...

Hello dear physics masters on earth, I am very grateful to be priviliged to ask you a question regarding electric fields and potential of a single-cpin helix. It is portrayed as below. It is a line of uniform charge, and 1-turn helix with radius R and height H. I have came to ugly answers, and...

Homework Statement Find electric potential at a center of charged rod with charge 'Q' and length '2a' if referent point is at infinity. Homework Equations Electric potential of a point charge: V=kQ/r Electric potential via electric field: integral (Edl) The Attempt at a Solution I used...

Electromagnetism: Multivalued potential voltage? It's been my understanding that specifying the electric and magnetic potential at all points in a system determines the electric and magnetic fields--and more, that we can fix a particular gauge, and it all still works. Perhaps I've been naive...

I'm studying for the physics GRE and am fairly poor with EM. 1. Homework Statement What is the work needed to assemble four point charges q into a regular tetrahedron of side length a? Homework Equations W = 1/2ΣqiV(ri) The Attempt at a Solution Assume that the origin is at one of the...

Homework Statement An electron is placed in an xy plane where the electric potential depends on x and y as shown in the figure (the potential does not depend on z). The scale of the vertical axes is set byVs = 500 V. In unit-vector notation, what is the electric force on the electron...

Hi! I have trouble with solving this problem and would be really thankful for some help. :) 1. Homework Statement Inside a thin, spherical metal-shell with a radius of 50 cm, a smaller homogenous metal-sphere with a radius of 20 cm is placed concentrically. The smal sphere is grounded through...

Homework Statement In a TV tube, an electric potential difference accelerates electrons from a rest positive towards a screen. Just before striking the screen, the electrons have a wavelength of 1.0⋅10-10. Find the electric potential difference.Homework Equations [/B] Should I use these...

Homework Statement If you have a conducting shell with charge Q surrounding a conducting sphere of charge negative - Q, what is the potential at the outside of the conducting shell? What about the inside? Homework Equations V=(kQenclosed)/r The Attempt at a Solution I don't know if the above...

Homework Statement A particle charge of 7.6μC is in a uniform electric field directred to the left. Another force, in addition to the electric force, acts on the particle so that when it is released from rest it moves to the right. After it has moved 8cm, the additional force has done...

Homework Statement There is a 4 cm by 3 cm rectangle with 2.0 nC charges at three corners. I'm trying to find the electric potential of the last corner in V. Homework Equations U=(kQq)/r I think V=(kq)/r I think The Attempt at a Solution I found the U's between the know corners but i don't know...

I heard that maximum electric potential for charged ring is at its circumference. Is there an expression to find the electric potential at any point on the circumference of a charged ring?

1. The problem statement, all variables a nd given/known data A rectangular trough extends infinitely along the z direction, and has a cross section as shown in the figure. All the faces are grounded, except for the top one, which is held at a potential V(x) = V_0 sin(7pix/b). Find the...

Hello! I have a question concerning the functioning of a pH meter. All the sources online that I can find either omit, I think, important information, or describe it in "technical terms" with equations. I would like to know what is happening at the level of the distribution and movement of...

Homework Statement A point charge q<0 lies just outside a uniformly and positively (non-conducting) charged ball. Assume the charge can pass through the ball freely. Describe the motion of the charge. Homework Equations Coulomb's force law, energy equation. The Attempt at a Solution Obviously...

Homework Statement Find the potential at a distance from a very long line of charge with linear charge density (charge per unit length) λ. I actually have this solved with the help of my book, but I need an explanation of the results. V = (λ/2πε)ln(rb/ra) Where the electric potential at rb...

Homework Statement So I've read two difference textbooks for electric potential and both of them define them in a different way and I'm confused as to which method I use because they yield results with different signs. The two ways I've seen it are: 1. ΔV = Vb - Va = -Ed 2. Va-Vb = Ed Do...

Homework Statement Point charges q and Q are positioned as shown. If q= +1.0 nC, Q = -2.0 nC, a = 3.0m, and b = 4.0m, what is the electric potential difference, Va - Vb? **The question with the diagram is also attached ** Homework Equations V = ke (q/r) The Attempt at a Solution V =...

I just want to make sure my understanding in this topic is correct. Positive charges will spontaneously move in the direction that lowers their electric potential (V), where as negative charges will spontaneously move in the direction that increases their electric potential. This in turn makes...

Two frictionless pucks are placed on a level surface, as shown, at an initial distance of 20 m. The mass of puck 1 is 0.80 kg and it has a charge of +3.0 x 10^-4 C, while puck 2 is 0.40 kg with a charge of +3.0 x 10^-4 C. The initial velocity of puck 1 is 12 m/s [E] and the initial velocity of...

Homework Statement I'm trying to figure out why potential energy decreases in this situation http://imgur.com/9PfjRVE Homework Equations ΔU = FΔy The Attempt at a Solution If I define up to be positive, and ΔU = FΔy. In this picture, force is pointing down (so it is negative) and the height...

Homework Statement An infinite solid cylinder of radius A and uniform charge distribution ρ is surrounded by a thin cylindrical envelope of radius B and linear charge distribution λ. The two cylinders are co-axial. Find the potential V(r) as a function of r from r=0 to r=∞. Homework Equations...

Hello everyone, Imagine two points that have a Electric Potential Difference of 10V and they are connected through a conductor wire. Let's call these points A and B: Now imagine we have a charge on A of 1C. To move the charge to B, we need to make a work of 10J, right? So, now, imagine the...

Homework Statement So I am working on an Electric Potential problem. There is a point P that is located on top of this rod ( this rod is aligned horizontally & is length L). I've solved this problem and got an answer. I want to find when y>>L using Binomial Approximation except I am quite...

Homework Statement Picture of problem is attached A rod of length L lies along the positive y-axis from 0<=y<=L, with L = 0.400 m. It has a positive nonuniform linear charge density (charge per unit length) λ = cy2, where c is a positive constant and has a numerical value of 8.00 x 10-7. (a)...

Homework Statement Homework EquationsThe Attempt at a Solution I could find how to solve #2,4, but I don't understand what #1,3 need to me. How can I prove some functions are scalar field or vector field?