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1. ### Magnetic Interactions vector diagram

The current is moving counter-clockwise. The magnetic field is 45 degrees down the right. How do you cross-product this?
2. ### Magnetic Interactions vector diagram

Okay, so what does that mean in terms of vectors? The questions asks to indicate the magnetic force on the current in the new wire (the one at P). So, is this force in the same direction as the magnetic field created by the other two wires (the ones we've been talking about this whole time)
3. ### Magnetic Interactions vector diagram

Oooooooh! Okay, this makes perfect sense! So, there are essentially two magnetic forces acting at P, the one straight down and the one to the right, which added together give a vector 45 degrees down and to the right. So, now I have to find the magnetic force acting on P, and they have added...
4. ### Magnetic Interactions vector diagram

But what determines why when the current moves into the page it has a magnetic field that is straight down, and when a current moves out of the page it has a magnetic field that is to the right? This is so damn confusing!
5. ### Magnetic Interactions vector diagram

I feel really stupid asking this, but if B circles around the wires, how can you draw a vector and say that B is straight down, or to the right? Isn't it technically moving around the wire, and not in anyone direction specifically?
6. ### Magnetic Interactions vector diagram

That does not make sense to me. When my thumb is down, B points straight down. When my thumb is up, B points to the right? Shouldn't B be in the opposite direction, since I is?
7. ### Magnetic Interactions vector diagram

Oooh I see. Okay, that makes sense. So then at the point where the current goes out of the page B points straight up? So, does this mean that the magnetic field at P is zero?
8. ### Magnetic Interactions vector diagram

Just at this point... is it moving straight up? (I point my thumb (which represents the current) out of the page... and my fingers are straight out)
9. ### Magnetic Interactions vector diagram

I am still really confused. If the current is going into the page, then the magnetic field could be at any angle on the page, as long as it was still perpendicular with the current. Do I say that the current is moving from the into the out, thus moving 45 degrees to the left, and thus the...
10. ### Magnetic Interactions vector diagram

They are from the diagram. So, that is all I do... use the right hand rule?
11. ### Magnetic Interactions vector diagram

Homework Statement Shown at right is cross-sectional view of two long straight wires that are parallel to one another. One wire carries a current out of the page, the other carries an equal current into the page. Draw a vector on the diagram to show the direction of the magnetic field, if any...
12. ### Faraday's Law and a metal loop

Homework Statement A metal loop is attached to an axle with a handle as shown. The north pole of a magnet is placed blow the loop and handle turned so that the looks rotates counterclockwise at a constant angular speed. Suppose the loop (the one above) were replaced by a second loop that...
13. ### Determining the Magnetic Force on a Moving Charged Particle

Fantastic! I got the answer... thanks!
14. ### Determining the Magnetic Force on a Moving Charged Particle

Well, the answer is supposed to be in N. And, since I am multiplying C, T, and m/s, then the -2500 should be in N also
15. ### Determining the Magnetic Force on a Moving Charged Particle

Oh, okay. This is all of the information they give... Learning Goal: To practice Tactics Box 24.2 Determining the magnetic force on a moving charged particle. When a particle of charge moves with a velocity in a magnetic field , the particle is acted upon by a force exerted by the magnetic...
16. ### Determining the Magnetic Force on a Moving Charged Particle

Homework Statement If the magnetic field of the wire is 2.5×10^−4 and the electron moves at 1.0×10^7 , what is the magnitude of the force exerted on the electron? Homework Equations F=qvBsin(theta) The Attempt at a Solution Sin(theta) = sin90 = 1 q = -1 v = 1e7 B = 2.5e-4 So...
17. ### What is the magnitude of the force on a calcium ion

Is +e the same as e-? Because 1 e- is equal to 1.6x10^-19 C, right? So, is that the same for +e?
18. ### What is the magnitude of the force on a calcium ion

Homework Statement Large electric fields in cell membranes cause ions to move through the cell wall. The field strength in a typical membrane is 1.0x10^7 N/C. What is the magnitude of the force on a calcium ion with charge +e? Homework Equations E = F/q > F = Eq The Attempt at a...
19. ### Multiple-Slit Interference (Again)

Homework Statement Consider the original double slit pattern from problem 1. Suppose that a third slit with the same width were added halfway between the original two slits. So that d goes from being 1 to being 0.5 for both. Would point Z be a principal maximum, minimum, or neither...
20. ### Multiple-Slit Interference

Awesome! Thanks :D
21. ### Multiple-Slit Interference

Okay, so theta = 0.23 degrees?
22. ### Multiple-Slit Interference

Homework Statement "If the distance between the centers of adjacent slits in the five-slit mask is 125[lambda], determine the angle (measured relative to the normal to the screen) to the minimum closest to the center of the screen." Homework Equations So, I have a question about the...