# potential electric energy

1. ### I Electric field in a circuit with a DC source

So I understand that when an electric field is produced in a conductor of length L, the net electric field in the conductor will be 0 because the rearrangement of electrons in the conductor results in the production of its own electric field which cancels out the one produced initially...
2. ### B Why there is a negative sign in the formula of calculating work done?

$$W = - \int _ { a } ^ { b } \vec { F } \cdot d \vec { r }$$ ( The Force here is referring to the applied force, When moving a positive charge towards another positive charge(stationary) / field In this formula why there is a negative sign in the formula? I am not asking the sign of the total...
3. ### I Electric potential difference between a battery's + terminal and the ground

Hi, I've a question about electricity in the following scenario: consider an accumulator (e.g. a 9V battery) and an analog/digital voltmeter having a probe connected to the accumulator + clamp and the other to the ground (for instance connecting it to a metal rod stuck in the ground). Do you...
4. ### Calculating voltage within and outside of a solid sphere

1. Homework Statement A solid sphere with radius R=12 m has charge Q=3 nC distributed uniformly throughout its volume. (a) Calculate the potential difference between a location at infinity and a location on the sphere’s surface. (b) Calculate the potential difference between a location on the...
5. ### Difference in potential energy of two charge configurations

Chapter 24, Question 61 Given two configurations, $C_1$, $C_2$ of $N$ point charges each, determine the smallest value of $N$ s.t. $V_1>V_2$. $C_1$: $N$ point charges are uniformly distributed on a ring s.t. the distance between adjacent electrons is constant $C_2$: $N-1$...
6. ### Velocity of Three Charges Released from Equilateral Triangle

1. Homework Statement Three equal charges with charge q and mass m are placed into an equilateral triangle of side length L. Find the speed of each when they are infinitely far from one another. 2. Homework Equations -ΔU =ΔK (since the electric force is conservative), U= 1/4πε Σq1q2 /r 3...
7. ### Capacitor Energy With Different Dielectrics

1. Homework Statement Two parallel plates are connected to a battery which maintains a constant potential difference of 12.0 V. The distance between the plates can be varied and there are three plates of different dielectric materials available: rubber (0.40 mm, κ = 6.7), glass (4 mm, κ = 7)...
8. ### Is negative potential energy actually meaningful?

Disclaimer: not sure if this is actually the most appropriate forum, but it is a question inspired by my work on a homework question...I'm happy for a moderator to move this to a different forum. (But General Physics states: NO HOMEWORK/COURSEWORK QUESTIONS HERE) 1. Homework Statement Ok...