# Search results

1. ### Four Charged Particles in a Square

F2+F3=\sqrt{2}kQq/a2
2. ### Four Charged Particles in a Square

Okay wow, thanks! Hehe, totally forgot how to find the resultant of two vectors I guess. :P Good call, I got it now!
3. ### Four Charged Particles in a Square

Homework Statement In the figure below, four particles form a square. The charges are q1 = +Q, q2 = q3 = q, and q4 = -5.25Q. What is q/Q if the net electrostatic force on particle 1 is zero? Homework Equations F=k|q1||q2|/r2 a2+b2=c2 The Attempt at a Solution I first drew a free...
4. ### Circular Interference, Newton's Rings

I figured it all out! Thanks so much for your help!! :)
5. ### Circular Interference, Newton's Rings

Yeah, I can find them, but do you actually need them to find how many bright firnges there are?
6. ### Circular Interference, Newton's Rings

So I think if i get this right, the equation for the maxima is 2L/\lambda=m? Its like the reverse of a bubble in air? It's only going to have a phase shift due to reflection once not twice. The air gap acts as the thin film. It just has a lower index of refraction than everything around it...
7. ### Circular Interference, Newton's Rings

The biggest thing to consider is whether there is a phase shift due to reflection off the bottom piece of glass right? Because that's going to decide whether the equations for the maxima and minima are 2L/\lambda=m or 2L/ \lambda =m+.5?
8. ### Circular Interference, Newton's Rings

But don't you need to know the index of refraction of the glass to figure that out?
9. ### Circular Interference, Newton's Rings

but how does adding λ/2 to the gap distance help? isn't it changing all the way from the center of the whole unit to the outside?
10. ### Circular Interference, Newton's Rings

Homework Statement The figure below shows a lens with radius of curvature R lying on a flat glass plate and illuminated from above by light with wavelength λ. This photo, taken from above the lens, shows that circular interference fringes (called "Newton's rings") appear, associated with the...
11. ### Two Light Waves Through Plastic

Dante! Its a small world! This is Doug btw. I can't figure this one out for the life of me...