# Search results

1. ### Magnetic Field of Currents

Homework Statement A long current-carrying wire, oriented North-South, lies on a table (it is connected to batteries which are not shown). A compass lies on top of the wire, with the compass needle about 3 mm above the wire. With the current running, the compass deflects 10 degrees to the...
2. ### Electric field of charge distributions

So, what you're saying for the second part is that the only electric field within this system is the metal sphere? Would the dipoles have any effect? If not, then the only net electric is to the negative y direction (as seen in the picture)? So then to calculate the electric field of just the...
3. ### Electric field between two deflection plates

Homework Statement In a cathode-ray tube (CRT), an electron travels in a vacuum and enters a region between two "deflection" plates which have equal and opposite charges. The dimensions of each plate are 12 cm by 4 cm, and the gap between them is 2.5 mm (not to scale in the diagram). During a...
4. ### Electric field of charge distributions

Homework Statement A small, thin, hollow spherical glass shell of radius R carries a uniformly distributed positive charge +Q, as shown in the diagram above. Below it is a horizontal permanent dipole with charges +q and -q separated by a distance s (s is shown greatly enlarged for clarity)...
5. ### Electric Fields involving Disks

Yep, thank you for your help, Hootenanny!
6. ### Electric Fields involving Disks

Now I'm just stuck on finding the charge of the glass disk. We are given the amount of electric force acting on the chlorine ion, which has a charge of -1.6e-19. And with the equation that relates electric force and electric field, F=qE, I can just set the equations up like this...
7. ### Electric Fields involving Disks

Ah, now I see the mistake! Thanks. So the only statement that is correct out of the 5 is the first one.
8. ### Electric Fields involving Disks

I don't think so. It would also act on other objects (assuming that there are other objects within that electric field).
9. ### Electric Fields involving Disks

Right, the 2nd statement cannot be true, since Force is in Newtons, whilst the electric field is in Newtons/Coulombs. As for the 3rd statement, I'm not entirely sure, but I would imagine that at any time or space, there will always be an electric field created by a charge.
10. ### Electric Fields involving Disks

Homework Statement A thin circular sheet of glass of diameter 6 meters is rubbed with a cloth on one surface, and becomes charged uniformly. A chloride ion (a chlorine atom which has gained one extra electron) passes near the glass sheet. When the chloride ion is near the center of the sheet...