Recent content by bbbbbev

I think the magnetic field is in the k direction, which is to the left, but I don't think that value for B is right. I put that in as my answer (on webassign), and it counted it wrong. I don't know what else to try! Thanks for you help! Beverly

Thanks! I got it. I figured out phi and just used that equation. Thanks guys.

Hi. I'm having some trouble with this problem: An electron accelerated from rest through potential difference 1.6 kV enters the gap between two parallel plates having separation 20.0 mm and potential difference 120 V. The lower plate is at the lower potential. Neglect fringing and assume...

Oh, thanks. I think I get it. Can I just find force in the i direction and then find force in the j direction and then multiply them together to get the magnitude in the k direction? I tried doing this: F_i = q x v_i x B_i F_i = (1.6E-19C)(3.6e6m/s)(0.03T) F_i = 1.728E-14 N F_j = q x...

Hi. Ok, here's the problem: An electron that has velocity v = (3.6 106 m/s) i + (3.7 106 m/s) j moves through a magnetic field B = (0.03 T) i - (0.15 T) j. (a) Find the force on the electron. I know how to find the force from scalar numbers (using the equation F_mag = q x v x...

Aggh! I'm such an idiot! What was I thinking? Haha, Thanks!

Hi. I have this seemingly easy problem that I cannot get the right answer to! Here it is: A parallel-plate capacitor has circular plates of 6.00 cm radius and 2.00 mm separation. Calculate the capacitance. Ok, so I thought the formula for capacitance was [(epsilon)_0 x Area]/distance...

Yeah, you're right. Bev is short for Beverly. I'm a she.

Thank you so much! That sounds like it makes sense. I'll try it!

Ok, thanks for the helping as much as you did. I'm not trying to be uncooperative; I just don't understand what you are talking about with all those symbols. Like, I don't know which symbol stands for which thing. I don't know what you mean when you say "the first triangle," and i don't know...

I don't get it. I don't really know what all those expressions mean. I'm sorry. I tried to draw a picture, but I can't tell where I'm supposed to put everything, so the equations aren't making much sense to me. I'm sorry, I just don't know what I'm doing.

Thanks, that helped a lot. I at least *think* I am setting the problem up correctly, but I only have one more chance to get the answer right, so I was wondering if you could just look at my work and see if it looks right. Here is my work (R = radius of disk): dE_x = (k(dq))/a^2 dE_x =...

A disk of radius 1.4 cm has a surface charge density of 4.9 µC/m2 on its upper face. What is the magnitude of the electric field produced by the disk at a point on its central axis at distance z = 12 cm from the disk? I tried solving this problem in the same way you would solve a similar...

I cannot figure out this problem. I mean, I can't really even figure out what it is asking. I am not expecting anyone to solve it for me or anything. I just need some help as to how to get started. Particles A and B Figure 22-25a shows charged particles A and B that are fixed in place on...

Thanks! I had forgotten to multiply by g somehow! I can't believe I didn't notice that before!