Electric charges Definition and 84 Threads

I set up a simple experiment where a dc current carrying bare wire conductor runs parallel with a electrically charged plastic ruler. When no current flows in the wire and the ruler is charged with electrons (by rubbing it with a fur) the conductor will be attracted to the ruler. When dc current...

Hi, I hve kind of a problem with this static electric question; There are two SIMILAR ping pong balls coated with aluminium paint and suspended using nylon string. Taking the imaginary line perpendicular to the wall, on which the balls are hanging from, to be the normal (although this is in...

Homework Statement The question lies in the equation, I do not understand where the SQRT of 3Q or the 2L^2 is coming from? Can somebody help me with this? The professor kinda breezed by this but I cannot find a valid explanation anywhere! Thanks in advance!

Homework Statement Two parallel conducting plates, separated by a distance d, are connected to a battery of emf \epsilon. Which of the following is correct if the plate separation is doubled while the battery remains connected? a. The electric charge on the plates is doubled. b. The electric...

Homework Statement In an inkjet printer, letters and images are created by squirting drops of ink horizontally at a sheet of paper from a rapidly moving nozzle. The pattern on the paper is controlled by an electrostatic valve that determines at each nozzle position whether ink is squirted...

Homework Statement An item starts with a net positive charge of +23.62µC. A total of 12.82 x 10^{14} electrons are transferred to the object. What is the final net charge? a. +228.7µC b. -181.5µC c. -25.67µC d. +181.5µC Homework Equations q=neThe Attempt at a Solution I'm...

Homework Statement set up:(they three are all connected) l (referred to as top) /\ (the bottom two called "leaves") - two leaves are separated when negatively charged rod touches the top of the (vertical thing that connects the two leaves at the bottom) - when rod is taken...

Homework Statement An electron is in a vacuum near the surface of the Earth. Where should a second electron be placed so that the electrostatic force it exerts on the first electron balances the gravitational force on the first electron due to Earth ? Homework Equations The Attempt...

hey everybody! i have an inquiry!...Why? and How?? people get "charged" and get self electrically shock or electroshock somebody else?... let me explain myself better...for example...my mom has like 2 weeks that she gets "charged" electrically...everytime she touches something she gets...

Given three charges fixed along the x-axis and their length from the origin, how do I find their magnitude in C's?

What is charge?

According to my book the electric charge of large bodies like the Earth and the moon is pretty close to zero. But the Earth has poles and a magnetic field, which suggests that it isn't uniformly distributed at all. These two things SEEM contradictory to me, what is it that I am not getting? k

Homework Statement A 10.0 nC charge is located at position (x, y) = (1.0 cm, 2.0 cm). At what (x, y) position(s) is the electric field a. -225,000i N/C b. (161,000i + 80,500j) N/C c. (28,800i + 21,600j) N/C Homework Equations E = (1/4\pi\epsilon)(q/r^2) F = Kq_1q_2/r^2 The...

Homework Statement Two equally charged identical conducting spheres, A and B, repel each other with a force of 2.0 x 10^5 Newton. Another identical uncharged sphere, C, is touched to A and then moved over right next to B. What is the electric force on A now? What is the electric force on C...

Two point charges, q1 = 4.0×10-6 C and q2 = -1.0×10-6 C, are located on the x-axis at x1 = -1.0 cm and x2 = 3.0 cm. (a) Determine the electric field at the origin. (b) Determine the x coordinate of a point on the positive x-axis where the electric field is zero; i.e., a test charge...

As far as I know, the brain generates electric pulses to communicate. If a human being is electrically grounded, how could the charge flow or get created in his brain? A grounded man shold be brain dead :), right?

Can some one please explain to me why charged particles attract neutral ones, yet if you place the numbers into the equation Ep=-kQq/r, it will show you that there is no potential energy between a charged particle and a neutral one, because one of the Q's will be 0. How does this make sense...

Homework Statement A +10mC charge is placed 0.20 m from a -2.0mC charge. Where on the line joining the 2 charges is the a) electric field equal to zero? b) electric potential equal to zero? Homework Equations The Attempt at a Solution I am not sure, but I think that the answer to...

I know that a current creates a magnetic field and so do moving electric charges. My question is how fast a single charge moves so that it will create a magnetic field. Should its velocity be around c to make that? Thks

Two electric charges, q1 = +22.8 nC and q2 = +10.1 nC, are located on the x−axis at x = 0 m and x = 1.00 m, respectively. What is the magnitude of the electric field at the point x = 0.50 m, y = 0.50 m? I used the equation E= ((k)(q))/r^2 for each q1 and q2. I don't know what to...

Why do electric charges of opposite sign attract each other but charges of the same sign repel each other?

can someone help me on this? thanks in advance: A positive charge +2q lies on the x-axis at x=-a and a charge -q at x=+a. Find a point where the electric force on the third charge Q would be zero. should i continue on using Coulomb's Law, and just use arbitrary variables or is there...

On my physics test yesterday, one of the questions was the following: At a particular point in space, a charge Q experiences no force. It follows that A. if charges are nearby, the total positive charge must equal the total negative charge. B. there is not enough information to...

I've been studying the Yang-Mills theory, which predicted the existence of massless charged particles. That theory was later proven to be wrong, but it made me wonder nevertheless - can there ever be massless charged particles? And if such particle exists, how will it behave? How will it...

A small metal plate is bolted to the ceiling, and an "electron pump" is connected between the metal plate and yourself (mass of 60 kg). The pump starts pumping electrons from the metal plate to you. How many electrons must be moved from the metal plate to you in order for you to hang suspended...

Two postitive charges +Q are held at fixed distance d from each other. A particle of charge -q is placed at the mid point between them and given a small displacement y, on the line perpendicular to the line joining them and released. Show that hte particle described SHM of period...

Reading about the double slit experiment in Six Easy Pieces I came across something I had questions about, which is how they detect whether an electron has gone through one slit or the other: "To our electron apparatus we add a very strong light source, placed behind the wall and between the...

Electric Charges and Coulomb’s Law Guys, help me solve these problems. I'm really in big trouble.. thanks guys! a)Two charges of equal magnitude exert an attractive force of 4.0x10-4 N on each other. If the magnitude of each charge is 2.0μC, how far apart are the charge? b)Three equal...

A barium nucleus has a charge of q = +56e (where e is the proton charge). a. find the potential V at a radius of 10-12 m from the Nucleus. If a Proton is released from this point, how fast will it be moving when it is 1 m from the nucleus? Note: Assume V (infinity=0) Any help?

Likewise, this similar problem also has me stumped A charge of 7.00 mC is placed at each corner of a square 0.80 m on a side. Determine the magnitude of the force on each charge. Any help would be greatly appreciated!

Could someone help me out on this problem? Derive a relation between the potential V and the magnitude of the Field E at a radial distance r from the axis of a very long uniformly charged rod of radius a ( r > a ).

Hello, I need some guidance. This is the problem: Imagine that we have a half sphere (hemishpere) that is hollow with a charge of +q distributed evenly across the inside of the "bowl". What is the electric field due to this charge at point P? I have attached an image to help visualize this...

Oh boy, for some reason I'm just not getting this. I must be fouling up some really simple part. He just dives into problems without explaining the derivations and uses of the problems. Forgive my lack of knowledge on use of units. My questions: "A uniform line charge extends from x =...

Charge A is +2.5*10^-5C Charge B is -3.7*10^-7C. A is 25cm away from B. Point C is 10cm away from point B. What is the electric field at C? All points are in a line A--B-C.