Q:The drawing shows two long, straight wires that are suspended from the ceiling. The mass per unit of length of each wire is 0.050kg/m. Each of the four strings suspending the wires has a length of 1.2m. When the wires carry identical currents in opposite directions, the angel between the strings holding the two wires is 15 degrees. What is the current in each wire?? Im not sure what equations to use for this problem.

Look at it this way a current I2 causes a magnetic field. if a current I1 is in a magnetic field then a force acts on it. F=I1*B*dl where B=I2*(mu0)/(2*pi*d) So the force between those two wires is given by this equation F=I1*I2*(mu0)*dl/(2*pi*d) mu0=4*pi*10power7 d the distance between them In this case I1=I2 dl which shows the lenght of the wire in the magnetic field equals 1 because you do not care about it's lenght from here on it is rather simple I hope

Q:i have a 1989 Nissan 240sx and im trying to install an aftermarket Pioneer radio (DEH-P20), my car only has 2 speaker which are in the front right and left side doors, i've gotten many wiring diagrams to help me install it and im pretty sure i have connected the wires correctly. the only problem is that after i got done connecting it, the radio wont power on.. if theres a defective power wire, what can i do to fix it? and also, where EXACTLY do i connect the Ground wire? oh and why does the car wires have multiple same colors for example, theres like 3 light blue wires non striped from the car, etc.?thank you

ground okorder /

Q:How can I investigate the resistance of wire and how it changes with the length of the wireCheers

If you don't have a multimeter, you can probably see the effect of resistance with a flashlight bulb and a small battery (AA or AAA, etc). Get a spool of wire, needs to be coated/insulated wire. Connect the bulb to the battery with the shortest wire possible. See how bright the bulb is. Then, connect again using the entire spool of wire (hopefully you can get at both ends of the wire while it is still on the spool). The bulb will be dimmer because the voltage at the bulb will be reduced by the resistance of the wire (resistivity per unit length X the length of wire). If the length of wire on the spool is too long, the bulb will not light up at all.

Q:I want to get an underground fence but i cant figure out what the difference in the wire they use and regular insullated wire. What is the difference and why can't i use regular wire instead of the wire that comes with the kit

There isn't anything special about the wire that comes with the kit, it is just wire. If you have already installed the fence and just need to enlarge the area you can use your own wire just make sure it is the same gauge wire as is already hooked up.

Q:I have a 1989 Nissan 240sx. Somehow the fan caught a hold of the wiring harness and tore all the wires. any idea how much it's going to cost?

Buying a wiring harness will be prohibitive, and even transplanting one from a wrecking yard can be expensive. The harness can be repaired by splicing in pieces of wire where wire is missing and splicing together damaged pieces of wire. It is tedious but not particularly time consuming - I spliced in a section of harness after an engine fire in about 2 hours, working slowly.

Q:Why is it that some wires get hot,having electricity flow throught them,while others don't?And why is it that when there is a lot of resistance in a wire, that it doesn't get hot?Why does the length of a wire has an effect on the temperature of that wire, and how exactly?

Well it depends. If you varry the current the temperature of the wire will also vary. You have to take into account the actual diameter of the wire, the wider the wire, and constant current, the cooler the wire will be when you run electricity through it. If you have a wire with HIGH resistance it will get HOTTER, thats how light bulbs work.

Q:I no longer have enough 0 gauge wire would it be bad to use 0 gauge power wire to the amp and 4 gauge wire to ground the amp?

all okorder /... or going into your audio dealer store asking for 3 to 5 ft of the 0 gauge wire for around 15 to 20 dollars at the max. you can also asking your friends for if the person has some extra wire willing to sale it for cheap, I totally would do it, and I have done that before.

Q:where also is fourth wire hooked in?

If you really have a 3-pole 4 wire system, the 4th wire is the neutral. (The other 3 wires are the phase wires.) It is much more common to have 2 phases with a neutral and a ground for a house. In either case the 4th wire connects to the neutral bus. How do you know which wire is the 4th wire? Test the voltages between the wires. You will have a bolt of lightning, if you connect the wrong wire to the neutral. Luckily, touching the incoming wires to your house is very rarely lethal.

Q:Or can stranded wire of the same gauge be subsitituted for solid wire without any consequences? The reason I ask is because its for a massive 4kJ capacitor discharge circuit, and I need all the energy delivered to the power coils im using, cant afford to have much leakage inductance.

You question about Inductance seems illogical. I can't imagine how a straight wire will affect a sudden discharge of current unless the wire is coiled (inductor) or have a shield attached to ground(capacitor). I believe the difference between the two wires are their direct current resistance which is very negligible if the wires are just a few feet long. The Capacitor that will discharge current directly to a coil is a 'tank circuit' and is a type of oscillator. Most likely, The inductance you will experience is caused by the power coil itself that feeds it back to the capacitor and vise versa. If that is true, I recommend a reverse shunt diode across the coil and a series diode between the capacitor and the coil.

Q:Someone Stole my stock radio out of my car (They cut it out) Now All i have in the is wires and I cannot afford to go get a new one installed.Here are the wires that are in my car

what you need to do is buy the book for your car at autozone. and look at the radio wiring diagram. i had a similiar porblem but with the book it shall tell you were to hook the wires