# Search results

1. ### Spherical conductors

1. Homework Statement thin wire connecting two conductors, a big sphere and a small sphere. What sphere has the most charge? 2. Homework Equations 3. The Attempt at a Solution The charge will want to distribute itself over the entire surface area of the two conductors...
2. ### Method of Images

1. Homework Statement Two point charges sit on either side of large grounded conducting plane. Give an expression for the force experienced by the charge on the left hand side. There is a neg charge on one side and positive charge on the other side. 2. Homework Equations The...
3. ### Infinately long magnet

1. Homework Statement What is the force from an infinitely long cylindrical magnet on a magnetic dipole? 2. Homework Equations M=Mz (given in problem) 3. The Attempt at a Solution My argument for this solution that since the magnetization is in the z direction and the cylinder...
4. ### NACL in Water

1. Homework Statement Imagine water in a metal bowl that is open to air. This metal bowl is grounded. You add some NaCl to the water. What would the distributions of the ions look like in the water. 2. Homework Equations I think this doesn't need equations, but just general...
5. ### Spherical conductors

1. Homework Statement Two equal sized spherical conductors are connected with a wire. Charge is placed in one conductor. What is the electric field look like? 2. Homework Equations E=q/4pi*ep*r^2 3. The Attempt at a Solution I think that since these two conductors are...
6. ### Conductors and electric field problem

1. Homework Statement What would the electric field lines look like if two opposite charges were placed within an infinite plane conductor? 2. Homework Equations None that I am aware of. 3. The Attempt at a Solution I know that electric field is 0 inside of the...
7. ### Electric Potential Cone

1. Homework Statement I am basically given a cone with uniform volume charge and told to find the area of highest electric potential. 2. Homework Equations I want to use the equation: V= q/4piEr 3. The Attempt at a Solution I am having trouble finding anything in my book. I...
8. ### Is this a traveling wave?

1. Homework Statement Is this a traveling wave? If so, find the speed and direction. e^-(a^2y^2+b^2t^2-2abty) 2. Homework Equations Probably relevant to know the differential wave equation. 3. The Attempt at a Solution I have a feeling that this is a traveling wave as it is...
9. ### Complex number in Denominator

1. Homework Statement Express (see attachment) with a real denominator 2. Homework Equations Not sure if there is really relevant equations to use here. 3. The Attempt at a Solution First I multiply the top and bottom by the exponential. That gives me e^ix/(e^ix-r^2). I...
10. ### Confused by the fractions in the parenthesis

1. Homework Statement Given: see attachment Five additional electrons are placed at the origin. What is the electric field now. 2. Homework Equations Electric field equations of E=q/(4pi*Eo*r^2) 3. The Attempt at a Solution I am wondering if the electric field would just be...
11. ### Complex numbers (arg)

1. Homework Statement I need help on a little review please. z=2-i What is arg(iz) 2. Homework Equations Well iz= 1+2i 3. The Attempt at a Solution I think this should end up being arg(2i/1) But this doesn't seem to make sense because I am wanting to find an angle here...
12. ### Analytic Formula

1. Homework Statement Derive an analytic forumula for a CDF 2. Homework Equations 3. The Attempt at a Solution All I really want to know is what an analytic formula is? I know that the CDF is basically an integral of the PDF. I have looked all over the internet and can not...
13. ### Determine the effective nuclear charge

1. Homework Statement The 3s state of Na has an energy of -5.14 eV. Determine the effective nuclear charge. 2. Homework Equations Zeffective = Z - S (not listed in text book, found this online when trying to figure out the problem) 3. The Attempt at a Solution Nothing in the...
14. ### Circuit Problem

1. Homework Statement This is the circuit in question. # 31. R1-R3 = 2 Ohms R4=16Ohms R5= 8 Ohms R6=4Ohms i6=1.4Amps 2. Homework Equations V=i*R 3. The Attempt at a Solution I see R5 and R6 as being in series, therefore r5*i6=11.2V r6*i6=5.6V Then I add them...
15. ### Charged Particles on a pendulum

1. Homework Statement What is the distance(d) separating the charged particles dangling on the pendulum? Length of Nonconducting string=120cm mass of particles= 10g Charge q = 1.2*10^-8 2. Homework Equations Fe=(k*q^2)/d^2 3. The Attempt at a Solution I think I...
16. ### Linear and Angular Momentum (conservation of)

Hi all, I have been working on this problem all night and although it should be easy, I can not seem to get the correct answer as in the back of the book. 1. Homework Statement A uniform, thin rod of length .5m and a mass of 4kg can rotate in a horizontal plane about a vertical axis...