Recent content by nuagerose

A box contains four tickets, numbered 0,1,1, and 2. Let Sn be the sum of the numbers obtained from n draws at random with replacement from the box. Find the exact formula for P(Sn=k) (k=0,1,2...) I started by finding the probability of the first few sums: P(Sn=0) = (1/4)^n P(Sn=1) = n *...

Would both angles be zero then?

The angle from the red dot to point P is 0, but I don't know how to find the angle between P and the infinite stretch of wire, since, well, it's infinite. There must be some flaw in the way I am looking at this problem. Help?

Sorry, I'm still confused. So you're saying one end of the wire is infinite while the other is not? Then would I use this equation instead? B = (μ_0*I) * (cos θ_1 + cos θ_2) / (4*pi*a), which is the equation for a finite wire? Then how would I find the two angles?

I am not given the length of the wire, so how do I account for that?

Homework Statement A very long wire carrying a current I = 5.0 A is bent into a semi-circle with a diameter of 10 cm as shown in the figure. What is the magnitude of the magnetic field at the point P, halfway between the ends of the straight sections of wire and at the center of curvature of...

Homework Statement http://ezto.mhecloud.mcgraw-hill.com/13252699450881445581.tp4?REQUEST=SHOWmedia&media=ch28q44a.jpg A long, straight wire has a 11.1‐A current flowing in the positive x -direction, as shown in the figure. Close to the wire is a square loop of copper wire that carries a...

Statistics problem---exponential approximation Homework Statement A box contains 2n balls of n different colors, with 2 of each color. Balls are picked at random from the box with replacement until two balls of the same color have appeared. Let X be the number of draws made. a) Find a...

F = (k*q_{1}*q_{2})/r^{2} Hope this is right. I suppose q1 would be the charge of the thin rod and q2 would be the charge of the point, which is e.

Homework Statement The figure shows a uniformly charged thin rod of length L that has total charge Q. Find an expression for the magnitude of the electrostatic force acting on an electron positioned on the axis of the rod at a distance d from the midpoint of the rod...

For the outer spherical shell, would it enclose the charge of the inner sphere? Also, given your explanation, I can then use the known electric field value at point P to calculate the charge of the inner sphere? From there, how do I work toward the charges on the inner and outer surfaces of the...

Homework Statement A hollow metal sphere has inner and outer radii of 20.0 cm and 30.0 cm, respectively. As shown in the figure, a solid metal sphere of radius 10.0 cm is located at the center of the hollow sphere. The electric field at a point P, a distance of 15.0 cm from the center, is...