Charges Definition and 1000 Threads

Homework Statement Find the net force at point A q1=-6x10^-5 C q2=-3x10^-5 C q1 is 3m north of A q2 is 3m east of A find the net force on a -1.2x10^-5 C charge The Attempt at a Solution first off I find how the electric field is with no charge at point A = 6.7 x 10^4...

Hi , am a computer science student , am newbie at physics , and am train to learn but no help , though i took a course in [physics 1] before 3 yrs and i can't remember anything, and now i am taking physics 2 , i took so far , electric fields , Gauss law ,Electric potential , capacitance . book...

What is a point charge? I have read wikipedia but m not much satisfied... please can you explain me in your own words? thanks

Homework Statement The e.m.f of a battery is 12V and provides an electrical energy of 500J. What is the amount of charges flowing in the battery for 5 seconds? 2. The attempt at a solution Since V=W/Q, rearranging the equation gives you Q=W/V: Q= 500/12 = 41.6666667 C But, I don't...

Lets say I have a negative line charge on a long thin rod, if I am at rest with respect to that rod I will see an E field. But If I am moving with respect to that rod I will see a B field. So why are people looking for magnetic monopoles, If B fields are E fields in disguise, wouldn't the...

Homework Statement In a plastic film factory, a wide belt of thin plastic material is traveling between two successive rollers with the speed v. In the manufacturing process, the film has accumulated a uniform surface electric charge density σ. What is B near the surface of the belt in...

Homework Statement Hi, here is the problem I'm having trouble with: Three charges Q1, Q2, and Q3, each equal to 6.4 × 10–19 C, are in a straight line. The distance between neighboring charges is 60 nm. Find the magnitude of the electric field at P, which is 80 nm from Q2 on a line at right...

Homework Statement Use Gauss' law to explain why field lines must begin or end on electric charges. Homework Equations Gauss' law: \epsilon_0 \phi_E=q The Attempt at a Solution I'm not sure whether this solution is incomplete or inconsistent. First, I take a gaussian surface...

Homework Statement 1. compare the induced voltage of the attached magnet ( two like charges) with the induced voltage of one magnet only? 2.compare the induced voltage of attached magnet (opposite poles) with one with only one magnet Homework Equations The Attempt at a...

I'm just learning but I can almost SWEAR that this is right, just reassure me?

Hello, Is the force experienced by a charge at any point between two charged parallel plates the same? Just a preliminary step to my homework question, Let's say I have two parallel charged plates. (positive on top and negative on bottom with field lines going downwards.). Would all positive...

Can permanent magnets be modeled as set of "magnetic charges"? Computing the full magnetic field of a permanent magnet and what forces two permenant magnets exert on each other is obviously a field theoretic problem that requires a solve using e.g. a FEA method or simular. For two idealized...

Hi everyone, I got a little question. Let's say we have 3 point charges on a line, for example on the x axis. 1----2----3 something like this. If I want to calculate the Force on point charge one, why am I allowed to just add the forces 12 and 13. I saw it in a book and was confused...

Homework Statement Consider a square which is 1m on a side. Charges are placed at the corners of the square as follows: +4 uC at (0,0) +4 uC at (1,1) +3 uC at (1,0) -3 uC at (0,1) What is the magnitude of the electric field at the square's center? Homework Equations E=...

Hi guys, I have a quick q about solving questions where there are two charges q1 and q2 approaching each other (in this textbook problem it is from 0.1 m to 0.01m). I understand that you have to keep one of the charges stationary and use the formula: W=q(Vf-Vi) = q1[ (k*q2)/r2 - (k*q2)...

Homework Statement A charged mass on the end of a light string is attached to a point on a uniformly charged vertical sheet (with areal charge density 0.25 μC/m2) of infinite extent. Look at attachment for diagram Find the angle \theta the thread makes with the vertically charged...

Homework Statement Four point charges have equal magnitudes. three are positive and one is negative, as the diagram shows. they are fixed in place on the same straight line, and adjacent charges are equally separated by a distance d. consider the net electrostatic force acting on each...

Homework Statement I have some hypothetical questions. Question 1 There is a conductor with a single electron and proton inside of it. If we try to charge the conductor by induction, we might put a proton close to the conductor. The electron will go towards that proton while the proton in...

can somebody explain about this self energy??

If accelerating charges emit light. Then would this imply that mass less particle could not emit light because they cannot accelerate?

I have recently found a circuit schematic that can pick up radio signals without the need of a battery. Is this an example of electromagnetic induction? If so, how much voltage/current is induced? Does it change the properties of the electromagnetic wave, e.g. energy, wavelength, etc...

I'm reading The Lightness of Being by Frank Wilczek. In a footnote talking about screening of a (real) positive charge by virtual particles (p47), he says "Thus the force falls off faster than 1 over the distance squared, as you'd have without screening" (by virtual particles). How then...

How to divide positive and negative charges from each other without them interacting with other matter or charge patterns. ,please answer I only need this to make my ultimate machine

I don't know, when given a point charge (sign is indicated = positive or negative), which direction the field lines go Although I NOW know that if the point charge is positive, field lines are outwards, and if negative then they are inwards...HOWEVER, I have come across an example or two...

I'm trying to get a deeper understanding of how two particles such as protons interact with each other. In high school physics, I was told that they give off a field, which is felt by the charges, and then repels them. My first question is, if I fire two protons at each other head on (lets...

The dealer where I bought my car is charging me 370 dollars to get my new tag for my new car. How much of that money is going towards the actual tag and how much are they taking out? I live in Florida. I tried looking on the DMV website and that's pointless. I saw no information that will help...

Homework Statement Two charges q1 and q2 are 11cm apart and have an electric force between them of 6e-6N. If the charge on q2 is increased by 12 times and the distance between q1 and q2 changed to .44cm, what is the new electric force between these charges? q1 ? q2 ? distance (1) 11cm...

Homework Statement In the figure below the charge in the middle is Q = -4.6nC. For what charge q1 will charge q2 be in static equilibrium? q1-----10cm------Q------10cm------q2 I know that the answer is supposed to be 18nC. Homework Equations F=Ke lq1llq2l/r2 The Attempt at a Solution...

If standing on Earth and being accelerated by a rocket out in space at g are the same thing, Or at least have the same effects. And if accelerating charges emit light then would an electron sitting on Earth emit light? But I don't see how this is possible because where would the energy come from.

Two charged particles are brought together from a great distance (r=infinity) to a distance of 2 m. The particle has a positive charge of 3.0 x 10^-5 C and the second has a negative charge of 1.35 x 10^-5 C. What minimum work was accomplished in this process? I can't for the life me figure...

Homework Statement "Two point charges 2.0cm apart have an electric potential energy -180 microJoules. The total charge is 31 nC. What are the two charges?" Homework Equations V= k * q / r The Attempt at a Solution I understand that V = -180 * 10^-6, k = 9*10^9, r = 0.02m, and the...

Homework Statement Two more +Q charges are held in place the same distance "s" away from the +q charge as shown. Consider the following student dialogue concerning the net force on the +q charge: The two added charges are written with blue Q's Student 1: "The net electric force on the +q...

Homework Statement A hollow sherical conducting shell is suspended in air by an insulated string. The total charge on the conductor is -6 microCoulombs. If an additional point charge of +2 microCoulombs is placed in the hollow region inside the shell what is the total charge induced on the...

Homework Statement When a certain air-filled parallel-plate capacitor is connected cross a battery, it acquires a charge (on each plate) of 130 μC. While the battery connection is maintained, a dielectric slab is inserted into and fills the region between the plates. This results in the...

Homework Statement 2 Spherical conductors B and C having equal radii and carrying equal charges repel each other with force F. Another conductor A having same radius as B but uncharged is brought into contact with B, and then C and then removed from both. Find the new force of repulsion...

Homework Statement Two positive point charges are 4.60 cm apart. If the electric potential energy is 75.0 x 10^-6 J, what is the magnitude of the force between the two charges? Homework Equations U=kq/r (1) F=kqq/r^2 (2) The Attempt at a Solution So I tried using (1)...

Homework Statement Four charges are arranged on the corners of a square whose edge length is a. Two positive charges +Q are placed on diagonally opposite corners, and two negative charges -Q are placed on the other corners. (a) What is the force on a test charge qo placed at the center of the...

Homework Statement Right hand rule to determine Homework Equations There is no equation The Attempt at a Solution At point 1 and 5 there is no induced current, at point 2 and 4 there is a induced current.

Homework Statement 3 identically charged charges are placed at corners of an equilateral triangle of sides a. I need to find the force felt by each charge. To do this I have calculated the force from charges - "2 on 1" and then "3 on 1". The answer i get is (2*q^2)/4*Pi*e*a^2. This is not...

Homework Statement I have a series of questions regarding electric potential at various points in space given various point charges. The one that would probably be best to focus on is a charge of +q and a second charge of -2q a distance "d" further along the x-axis, find the non-infinity...

Homework Statement I am looking to demonstrate that the expressions for the charge and current density of point charges satisfy the equation of continuity of charge. Intuitively it makes sense to me but I run into trouble with the delta function when I try to prove it mathematically.Homework...

Homework Statement Two point charges of magnitude 4.79 nC and −1.11 nC are separated by 39.4 cm. The acceleration of gravity is 9.8 m/s^2 The Coulomb constant is 8.98755×10^9 N · m^2 /C^2. What is the potential energy of the pair of charges? Answer in units of V. Homework Equations...

Homework Statement How much work is needed to arrange three charges, Q, into an equilateral triangle? The particles are initially infinitely far apart. Take 'a' to be the length of each side of the triangle. Homework Equations U = {(kqq)/L} The Attempt at a Solution I was under...

Two point charges are located on the x axis: one charge q_1 = -15.0nC located at x_1 = -1.745m , and a second charge q_2 = 38.5nC at the origin.What is the total force along the x axis, including sign, exerted by these two charges on a third charge q_3 = 47.0nC placed between q_1 and q_2 at x_3...

Homework Statement A point charge q = +2.8 µC is placed at each corner of an equilateral triangle with sides 0.19 m in length. (a) What is the magnitude of the electric field at the midpoint of any of the three sides of the triangle? Homework Equations E=kq/r^2 k=9e9 all q's are...

An estate agent charges 0.75% fees... Homework Statement An estate agent charges 0.75% fees on the sale price of a house. 1. Find his fees if a house is sold for €450,000 and VAT @ 20% is added on. 2. Find the selling price of a house if the fees are €2775 before VAT is added Homework...

in the case of a spherical conductor the charges reside on the surface...the electric field is perpendicular to this surface (radial) and no parallel component exists ,as it leads to the flow of charges across the surface...why is this flow not feasible i.e why does the parallel component...

Homework Statement Two charges +Q and -Q are a horizontal distance a apart and a vertical distance b above a large conducting sheet. Find the components of the forces acting on each charge. Homework Equations The Attempt at a Solution Ok well I've tried to solve this using image...

Homework Statement At t=0m the switch is open and both capacitors are uncharged. What are the charges on each plate (magnitude and sign) of each capacitor long after the switch is closed and capacitors are fully charged? Homework Equations q=C E(1-e^(-t/RC) The Attempt at a Solution...

Homework Statement An equilateral triangle has sides of 0.11 m. Charges of -8.6, +8.0, and +1.5 µC are located at the corners of the triangle. Find the magnitude of the net electrostatic force exerted on the 1.5-µC charge. Homework Equations kqQ/d^2 The Attempt at a Solution first...