Electricity and magnetism Definition and 210 Threads

Hello: Many many years ago I walked away from community college with an associates degree in physics, and despite my fondness for the subject, I had to put it aside for other things. I recently happened upon something that lead me to realize how much I had forgotten, and so I've decided to...

Yes, yes I know about the template, but these questions are so basic that I don't really know what I can show as work... Sometimes all I need for help is the relevant equation itself -.- So please don't delete or hate. Thanks! 2. http://tinyimage.net/images/50136173150204648365.png The...

Homework Statement What is the Kinetic Energy of an electron that passes undeviated through perpendicular electric and magnetic fields if E = 4.0 kV/m and B = 8.0 mT? m_{e} = 9.1 \times 10^{-31} \textup{kg} q_{e} = 1.6 \times 10^{-19} \textup{C} Homework Equations I got stuck doing...

How much E&M is involved in a MechE degree? I'm a high school senior in AP Physics C: E&M and I hate it with a passion. I loved Mechanics, but E&M is terrible. Would I just need to take the one required class (Physics 2), or do I need to use multiple E&M concepts throughout undergrad? I am...

I apologize, I wrote all of this out in a word processor before attempting to post it and I did not notice that there is a template for giving problems. I hope you forgive me, my posts tend to be wordy and take awhile to write; attempting to write it in the text box would result in the server...

Homework Statement The potential caused by an array of charges in a region of space can be described by the equation V(x,y,z)=2x+xy+y2-xz2 volts, where all distances are measured in metres. If a charge of 2 mC is moved from the position r1=(1,2,0)m to r2=(3,1,0), calculate the resulting change...

Does anyone know where I can purchase the hardcover 1985 Electricity and Magnetism? Some schools, such as Caltech and MIT, still use the book; however, Caltech does not have it in their online bookstore and MIT lists an 09 edition (which I assume is an ebook?). Some copies are floating...

I'm taking E&M next semester, and the book we use is quite good at explaining concepts, but it only has 9-12 questions per chapter. I would like to do more practice problems. We used the same book for modern mechanics (it is a two-edition set, the first is mech and the second is E&M). Any...

? I'm just curious. Also I'm having trouble with mechanics. I feel like i have no idea how to grasp fnet and calculating it. I also REALLY REALLY REALLY suck at drawing free body diagram. Math is a walk compared to physics which feels like a marathon. I'm actually not that great with math but...

I'm taking gen. physics 2, which consists of electric fields, magnetism, stuff like that. Big difference from classical mechanics in physics 1. I remember in calc III, I learned nothing from my professor because he didn't know how to teach. I basically learned the entire course from Paul's...

Hi guys, I was answering some questions on my physics homework and I didn't understand why the answer was what it was... the first question was this: 1.) A hollow uncharged metal ball hangs from a silk thread. A glass rod has been charged by rubbing with rayon. When it is brought close to...

HI, So say you have a small ball hanging vertically below a positively charged plate. When the ball is released from rest with the string at a small angle to the vertical, it swings in periodic pendulum motion. If the ball is now positively charged, does the period increase, decrease or stay...

good afternoon, these are my problems, I already tried to solve them but my anwers isn't well: 1-the electrical potential at certain distance of a charge of 600 V. and the electrical field is 200 N/C. At what distance of this charge is it necessary to place a charge of 0.1x10 ^-6 C and the...

I'm a first year undergraduate taking my first electricity and magnetism class, and going through all the classic material: Coulomb's law, electric fields, flux, capacitors, etc. And the book I have explains the material relatively well, but I feel like I'm missing out on so much by just being...

I completely made this question up because it's related to class and it will help me understand the lesson better and more. Explain the work of scientists and how they revolutionized scientific thought. Include Max Plank, Einstein and Michelson-Morley. The work doesn't have to be only about...

I sincerely intend for this not to be a rant, please do not take it in this way. Well, the first half of my physics B AP class is over. We are all done with mechanics (/happyface) and now we are going to start part 2: Electricity and Magnetism. Mechanics was very hard for me. Why? I have no...

Maxwell's "A Treatise on Electricity and Magnetism" I bought this book as a supplement to my electromagnetism I class, but the moment Maxwell goes into anything mathematical, I'm lost. The lack of illustrations and reference to many out-dated terms makes the book hard to follow. The book is a...

electricity and magnetism HELP! hi, I am trying to studying physics 2 (electromagnetism) before next semester. the school uses college physics by serway, which is just not working for me do you have any recommendations of books that will supplement the material on a conceptual basis? is the...

Feel Free to give tips or answers to any or all of these questions Homework Statement 1. Two Point charges qa and qb are located on the x- axis at x=a and x=b on the graph of E the x-component of E. a) What are the signs of qa and qb? b)What is the ratio of|qa/qb|? c) Draw a graph of...

Are electricity and magnetism field lines the same? please be detailed!

does the fact that a moving charge creates a magnetic field, and a moving magnet creates an electric current, imply that the two are related or inverses of each other? -Tom

Why is it that 2 wires carrying parallel current attract each other i think they should repeal imagine 2 wires carrying electrons to the left then the current is to the right, in the reference frame of the moving electrons it seems like the electrons on the other wire are not moving so the...

A 1.0 E -6 F capacitor has a charge of 10.0 micro C. It is connected to a 1.0 H inductor at t = 0. Compare the potential energy of the capacitor to the potential energy of the inductor at t = 10s. Which energy is greater?

I was reading Michio Kaku's book Prallel Worlds recently and I believe I saw it say that Maxwell's equations for electricity and magnetism become the same for electricity and magnetism when monopoles are introduced. My question is, if the equations become the same then why don't we say that...

Hey, first of all, I wanted to know that if you pass an electric current through an iron rod, for example, then what would be the relationship of it's electric field and magnetic field? Will they be parallel to each other or perpendicular?:confused: Second: suppose to fire a particle, let it...

Homework Statement The points A,B,C are the vertices of an equilateral triangle, of side L. Two equal positive charges q are at A and B. A)Find the electric potential at C assuming V=0 at infinity B) Give the expression for the work necessary to bring a positive charge Q from infinity to C...

Electricity and Magnetism questions...Gauss's law, grounding..etc. Alright so I am finally starting to understand the material, but I have a few questions. 1. An insulating spherical shell with an inner radius of 0.1cm and outer radius of 0.3 cm carries a total charge of 20nC. Use Gauss's law...

Ok, I finished my physics I calculus based class, and really I don't feel like I learned a lot or mastered the material. I would spend many minutes nearing hours trying to think over my homework but with a load of other classes and the fact that we got all the hard and I do mean hard problems...

Homework Statement Three plastic sheets that are large, parallel and uniformly charged are placed side-by-side. The electric field strength between sheets 1 and 2 is 2x105; the electric field strength between sheets 2 and 3 is 6x105. What is the ratio of the charge density on sheet 3 to that on...

I'm a little confused about "voltage". We learned that voltage is somewhat similar to electric field: a way to refer to the potential energy of a charge A when put near charge B without actually knowing the charge of charge A. That made sense to me, but then suddenly in class (this is college...

Homework Statement Find the average potential over a spherical surface of radius R due to a point charge q located inside. Show that in general: (EQ 1 below), where Vcenter is the potential at the center due to all external charges and Qenc is the total enclosed charge Homework Equations...

Hello I have these two questions on electricity and magnetism which I don't understand very well these are: (Q1) If a closed surface encloses no charge, and electric field lines cross the surface. (Q2) Under what conditions can coloumb's law be used to find the electric field strength...

Homework Statement Two infinitely-long lines of charge run parallel to the z-axis. One has a positive uniform charge per unit length, [lambda]>0, and goes through the x y plane at x=0, y=d/2. The other has a negative uniform charge per unit length, -[lambda], and goes through x=0, y=-d/2...

Homework Statement Purcell 3.3: In the field of a point charge over a plane, if you follow a field line that starts at the point charge in a horizontal direction, that is, parallel to the plane, where does it meet the surface of the conductor? Homework Equations The problem 'hint' is...

1. wHAT ARE ENERGY SOURCES AND POWER STATIONS? 2.WHO WAS THE FIRST PERSON TO DISCOVER THE ENERGY SOURCE? 3.WHO BUILT THE FIRST POWER STATION AND WHO DISIGNED IT? 4.WHY DID HE/SHE DECIDED TO BUILD THAT POWER STATION THERE? 5.WHAT DO SOUTH AFRICANS GAIN FROM THAT POWER STATION? 6.IS THERE...

I know that electric fields generate magnetic fields (when you put a compass next to a wire that has current in it the needle moves indicating that a mag. field is present). I know that changing magnetic fields can generate electric fields or induced emf. What does electromagnetic waves...

Hey everyone, I have a few questions. What is the link between electricity and magnetism? Why would moving electrons(current) create a magnetic field? Why does a moving magnetic field induce a current in a conductor? Thanks for responces.

I have a couple of questions in E&M. a)Can anyone tell me what a coaxial resistor and a coaxial capacitor looks like? (Approx Diagram) Because I am not sure which equations apply to them since I am not sure what they look like. b)How do I find a self energy of a charged sphere? Split it into...

Homework Statement Two identical conducting spheres each having a radius of .5 cm are connected by a light 2.3 m long conducting wire. A charge of 53 uC is placed on one of the conductors. Assume that the surface distribution of charge on each sphere is uniform. Determine the tension in the...

Homework Statement Five point charges on a straight line are separated by a distance of 0.01 m. For what values of q2 and q4 would the net force on each of the other three charges be zero? q1-----q2-----q3-----q4-----q5 Where: q1= 2x10^-6 C q3= 1x10^-6 C q5= 2x10^-6 C Homework...

Does anyone know where I can find some comic strips about electricity and magnetism.

Lithium-6 ions (mass is 6x a proton mass) are charged Li+ ions (one extra proton). They are accelerated by 2000 volts and passed through a velocity selector with a magnetic field of 0.020T into the page. The ions follow a straight path through the selector and are then deflected onto a piece of...

A couple of questions. 1. A capacitor of capacitance C is discharging through a resistor of resistance R. When will the energy stored be equal to half its initial value? My logic went like this: Energy in a capacitor (U) = Q^2/2C so: Q = (2CU)^0.5 so therefore the charge when the...

A solenoid 2.9 cm in diameter and 15 cm in length has 300 turns and carries a current of 5 A. Calculate the magnetic flux through the circular cross-sectional area of the solenoid. -->> I tried using the equation B = u(0)NI/L to calculate magnetic field, and then putting this in the formula...

Physics 122 Course by Frank L. Wolfs (homepage - http://teacher.nsrl.rochester.edu/) Department of Physics and Astronomy University of Rochester http://teacher.nsrl.rochester.edu/phy122/Phy122HomePage.html#info Course notes [see post #4 for revised link]

The potential is constant throughout a given region of space. Which of the following statements is true? Be sure you can justify your answer. 1. The electric field is zero in this region. 2. The electric field may have places where it is zero, and places where it is...

Electricity and Magnetism urgent!pls! An infinite long line of charge of constant charge density a is located near the line AB which carries uniform charges with charge density b. Suppose both two lines are in the same plane, calculate the electrostatic force exerted on the line AB. i don't...

Electricity and Magnetism urgent!help! 11. Electric charge is distributed uniformly along each side of a square. Each side of the square has length a. Two adjacent sides have positive charge with total charge +Q on each. (i) If the other two sides have negative charge with total charge –Q on...

1) A horizontal metal rod of 1.5m long is aligned in and East-West direction and dropped from rest from the top of a high building. Calculate the e.m.f. induced across the falling rod 2.5s after release. The horizontal component of Earths magnetic field is 2x10^5 T. Surely you need the area...