# Search results

1. ### 555 timer

Nope, that's how I made it. If I disconnect the output/diode junction from ground, would it sink the current?
2. ### 555 timer

Can you tell me what is wrong with my timer. I want it to make a relay open and shut periodically. For some reason it's not working.
3. ### Creating an electric field

Well I didn't want to say because I didn't want to be scrutinized, but this would be a good opportunity for you all to explain how this device fails, if it fails. And you're not allowed to say the first law of thermodynamics because that's too obvious. What I'm trying to design is a...
4. ### Creating an electric field

Thanks again Redbelly98, I guess I won't be building this device.
5. ### Creating an electric field

Cool, thanks.
6. ### Creating an electric field

If the method of images is applied to a conducting sphere and a point charge, it can be shown that the two will attract. Therefore, I will try charging a single plate and getting rid of the other.
7. ### Relationship between gravity/kinetic energy

Are you asking about the acceleration due to gravity? If so, yes. The gravitational foce will cause you to accelerate, hence your velocity (along with your kinetic energy) would increase. K=.5mv^2 A weaker G-field will just make you accelerate slower.
8. ### Creating an electric field

The field should cause a charge separation inside the BB because its a conductor, right?
9. ### Creating an electric field

I want to create an electric field that will cause a copper BB to move. So far I have tried using a 9V battery with the positive end attached to a metal sheet and the negative attached to another sheet, like a capacitor. Unfortunately this hasn't worked. Any ideas?
10. ### Microwave Optics

This is a question I came across in lab. I inserted a reflecter between a microwave transmitter and receptor, with the plane of the reflector parallel the the axis of the beam. The reflector is then moved away. See the setup and data plot in the attachment. I understand that the waves...
11. ### Definite Integral

Yea, I didn't have it in the right form. It's for a physics class, so the books says to use a table to help. I think I will try to solve it out anyway. Thanks for the help.
12. ### Definite Integral

Homework Statement solve the integral: ∫_(-∞)^∞▒〖x^2 e^(-λ(x-a)^2 ) 〗 dx where λ and a are positive real constants The Attempt at a Solution I tried integration by parts with and without y-substitution but neither worked for me. Without substitution, I set up the integral to look...
13. ### 555 & 556 timers

No, I've never heard of this. I'm new to electronics and was hoping to use the 555 timer because I understood it.
14. ### 555 & 556 timers

I'm planning on using a 556 timer for a 3-way solenoid valve. I need to have both valves closed for a period of 10 seconds, then open the first valve for 20 ms, followed by the opening of the second valve for 20 ms. This is astable. Is it possible to line up the timing using a 556 timer or do...
15. ### Potential Due to a Collection Charges

Right, initially I thought there was no field because I calculated it to equal zero. Then I realized that the potential is relative and can have whatever value. This material is best understood if you graph the potentials for the two cases.
16. ### Potential Due to a Collection Charges

Ok, I think I figured it out. See if you can follow my logic. First of all, the potential is whatever you define it to be because you can add a constant. For the proton in the middle of two other protons, its potential is the same as a proton the same distance away from a particle of...
17. ### Potential Due to a Collection Charges

My text reads for Potential Due to a Collection Charges: 1/(4πє) ∑ q/r I'm consfused about the distance and how it's treated as a scalar. Let's say you want to calculated the potential between two protons. If a proton (or electron) is placed in the middle, there will be no net force...
18. ### Potential Due to a Collection Charges

Woops, I didn't read the forum rules. I appreciate your help Doc Al. This won't happen again.
19. ### Potential Due to a Collection Charges

My text reads for Potential Due to a Collection Charges: 1/(4πє) ∑ q/r Lets say you want to calculate the potential between two charges. Do you take the magnitude of the distance (r) or do you account for their direction of the charges with respect to the field point. Based on the...