Q:Given following setup of three wires in the plane of the page with I1 = 1.3 A (to the right), I2 = 3.4 A (to the right), I3 = 4.5 A(to the left) and each wire is separated by 3 m.I'm completely lost, I need to..1. What is the direction of the magnetic field at wire 3 due to wires 1 and 2?2. What is the direction of the force on wire 3 due to wires 1 and 2?Any help would really be appreciated! Thanks!

I assume that those wires are sitting parallel 3 m apart from one another. 1. The magnetic field around a wire forms concentric circles around the wire. Wire 1 and Wire 3 are parallel so when you draw a concentric field line around Wire 1 with radius 6 m, you get a magnetic field line passing Wire 3 at a right angle. And a concentric field line around Wire 2 with radius 3 m passes Wire 3 at a right angle. Both magnetic fields have the same direction because the current in both wires flows in the same direction (to the right). Using the right-hand rule, you can find that the magnetic field at wire 3 due to Wire 1 and Wire 2 goes into the page. Ans: Into the page 2. The force on a wire can be calculated in the following manner: I X B * L. Here I is the current on Wire 3, B is the magnetic field due to Wire 1 and Wire 2, L is the length of Wire 3, and X is the cross product operator. So I cross B would give the direction of the force. Now use the right-hand rule, I cross B will give the force direction pointing down. This means the force due to the magnetic field would repel Wire 3 from Wire 1 and Wire 2. Ans: The force on Wire 3 due to Wire 1 and Wire 2 would repel Wire 3 from them.

Q:I have an old house and am replacing a dimmer switch in the kitchen.The old switch is has only 2 wires coming out of the switch that are both black. From the wall 2 wires connect to the 2 black wires on the switch, one is black which I have concluded is hot and the other is red, which must be the common wire. My question is that there is a 3rd wired that is pushed into the electrical box that is capped and not being used. This wire is white. I can only assume that would be a ground wire, but why would it be white in color. Can you tell me what the coloring scheme was for wiring old houses? Now I can connect the switch and use only the black and red wire, but would like to ground it properly if possible.

These would be normally. You should have them checked before you connect something. Black is hot White Neutral Red wires are also used for hot wires, switch legs (like to a ceiling fan), and are the second hot wire in 220-volt installations. Another useful application is the interconnect wire between two hardwired smoke detectors. A ground would be green or bare.

Q:i just bought a 97 jeep wrangler..the soundbar isnquot;t hooked up. I pulled the carpet back and found the following: a red wire connecting the soundbar to under the dash (probably power), and a black wire connecting the soundbar to metal. there are 4 small wires unattached to anything coming from the soundbar, and a red and white sound wire coming from under the dash (actually has plugs like on a tv surround system), and a ground wire all unattached. how can i hook this mess up to make the soundbar work. i do have sound coming from the front dash speakers. thanks for help.

Well the rca connections are either an input for an auxiliary device or an output for an amp. The ground wire should be grounded as long as it is a ground wire, a lot of radios are case ground and will work with out the wire grounded but may experience interference. As far as the wires coming from the sound bar, there is no need to replace the entire wire. Usually radios have four speaker outputs, front left, front right, rear left, rear right. Each pair is color coded and one of the two wires has a stripe on it. Once you determine which wires from the sound bar are pairs you can hook them up to the back of the radio, positive and negative wont make a big difference unless its a specific frequency range. You may notice a slight variation in sound if you turn the volume up loud. In that case just reverse the wires. You'll also want to find out which pair of wires from the radio is for which speaker location and hook them up correctly. You don't need to be worried about getting shocked from the speaker wires so you can test the different outputs with the radio on but you must be careful not to touch the wires from the radio together or you can short out the radio. As far as the red wire, it should be the power wire for the light and the black is ground. Make sure any wires you connect are firmly connected and covered to prevent shorting out. Shrink tube is quite cheap.

Q:I removed a dishwasher and now the wires are exposed. I turned off the circuit to that outlet. I am planning on waiting a while to replace the dishwasher. I want to turn the circuit back on so I can use the other outlets, but don't want to leave the wires exposed. Any ideas?

N.E.C. code requires the wires to be placed in a box with a blank plate. use wire-nuts or black tape on the wires

Q:where does the expression 'down to the wire', come from?

I found this online: The wire is used in a four-legged footrace-- at least I've only ever heard the word tape used for races involving bipeds. That and ribbon. The wire in question is an actual wire, and it's used in the Sport of Kings, horseracing. A tape or ribbon would be too stretchy to instantaneously trip the shutter on the finishing-line camera when it was crossed. A horse has no problem busting through a single strand of wire.

Q:The wire on my headphones were cut clean off in the middle of the wire. Is there any way it can be fixed? I tried to find out other ways but it seems one of the only ways is to strip the wire of its covering. Is there a way to fix it without burning the wires?

I totally agree with Mr. Smith. However, I would use heat shrink tubing for a neater look than the tape.

Q:Does lime wire add a lot of pop-ups and slow down your computer?

I by no ability had any problems with Limewire messing up my pcs overall performance in my view, yet once you're asking approximately your pc's protection, there are different pretend downloads which will provide your pc viruses. My terrific suggestion is to preview the record in the past you end the obtain. If Limewire is rather messing up your pcs overall performance, uninstall it. in the experience that your pc maintains to run slowly, verify for viruses...

Q:i hav a 2000 explorer and just got a new head unit and bought a wiring harness to hook it up. on the wiring harness that's supposed to be plugged in to the truck there are 2 illumination wires, 1 of them is the illumination ground .Out of my new stereo there is only the illumination wire not an illumination ground wire. where do I put the illumination ground ? also i have 2 ground wires coming from my new deck 1 is 12v ground and the other is a chassis ground can i just hook them together?

workin for best answer 2000 Ford Explorer Car Stereo Radio Wiring Diagram. Car Radio Constant 12V+ Wire: Light Green goes to your yellow deck wire Car Radio Switched 12V+ Wire: Yellow/Black goes to your red deck wire Car Radio Ground Wire: Black goes to your black ground wire Car Radio Illumination Wire: Light Blue/Red goes to your illumination wire Car Radio Dimmer Wire: N/A Car Radio Antenna Trigger Wire: Blue Car Radio Amp Trigger Wire: N/A if u have a amp this goes to your blue remote wire Front Speakers Size: 5″ x 7″ Front Speakers Location: Doors Left Front Speaker Wire (+): Orange/Light Green Left Front Speaker Wire (-): Light Blue/White Right Front Speaker Wire (+): Dark Green/Orange Right Front Speaker Wire (-): White/Light Green Rear Speakers Size: 5″ x 7″ Rear Speakers Location: Rear Door Left Rear Speaker Wire (+): Gray/Light Blue Left Rear Speaker Wire (-): Tan/Yellow Right Rear Speaker Wire (+): Orange/Red Right Rear Speaker Wire (-): Brown/Pink hope this helps

Q:how do I replace this, the wire is built into the speaker and runs into the unit.

If you have enough wire, just twist it back together and cover the open wiring with electrical tape. If he took out a chunk of wire, just buy some more speaker wire and do t he same thing. The wires should be red and black, just connect the red to the red and the black to the black. It's a really quick and easy fix you can do yourself.

Q:On what actually does ampere depends, thickness of wire or number of turns of wire or what else? Electrical

Your okorder /... and get ohms/1000 ft for the size of wire you select. Also check fusing current while you are there. Eg, #30 has 105 ohms/1000'. So if you have 10' of wire, it's resistance would be 105/100 = 1.05 ohms. Once you have the resistance, use ohms law and the voltage applied to calculate current. For 12 volts, I = 12/1.05 or 11 amps. Fusing current is 10 amps (which is in the open, not in a coil) so you need more length or thicker wire. For AC, and coils, you need more complicated calculations.