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See the related link Electro Magnetic Fields for a picture.
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∙ 13y ago
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Why do you use complex numbers?
Complex numbers can help visualize physical effects like the electromagnetic fields around wires carrying current. Refer to the link below.
How is a complex number used?
A complex number, equations and graphs can show electromagnetic forces-for instance two wires carrying current. A formula like (z-1)/(z+1) can show the fields around two parallel wires.
Do electric currents create magnetic fields?
yes. If current is flowing through a wire, the magnetic field is around the wire, like your fingers would be around the wire if you gripped it. If the current was alternating (AC) the field would collapse and expand in time with the alternations. One of nature's mysteries - to me anyway.
How do the electric and magnetic field of an electromagnetic wave regenerate each other?
No. Current flow creates electromagnetic fields in space. Electromagnetic fields, in turn, can create current flow in conductors. The electric fields do not directly create magnetic fields, nor do magnetic fields directly create electric fields.
In electronics wires that carry equal but opposite currents are often twisted together to reduce their magnetic effect at distant pointswhy is this effective?
A pair of wires which carry equal and opposite currents are called balanced transmission lines. When current flows in a single wire in one direction, it creates a magnetic field around the wire and acts like a coil. This is called unbalanced and coaxial cable is an example. With balanced transmissions lines, the current travelling in one direction cancels out the magnetic field produced by the current flowing in the other wire in the opposite direction. Each attempts to create a magnetic field in opposite directions around the transmission line and, since the currents are equal, the magnetic fields are exactly cancelled out and very little or no magnetic field is produced. One big advantage of balanced transmission lines is the lack of what is called, "common mode" noise. Currents in wires not only produce magnetic fields, they are affected by them. Noise produced in one wire is produced equally in the other and the current and voltage difference between them remains the same. Twisting the wires has little extra effect in free space but does help when the transmission lines come close to other wires and other metals. If the two wires were straight and one of them was close to a metal surface, there would be a greater capacitance between the wire closer to the surface changing the velocity factor of one wire and not the other. Twisting the wires balances out capacitive effects in such circumstances.
What does the letters acdc stand for in the rock band?
AC is alternating current like in your house. DC is direct current like in your car.
What the advantges of complex numbers?
one advantage is that it is easy to graph some electrical situations like the magnetic fields around two conductors carrying current. the complex formula is w=(z-1)/(z+1). notice the fields are at right angles to each other. REFER TO THE LINK FOR A PICTURE.
What is the difference with the condenser lens in a light microscope and a electron microscope?
Light-lenses are made of glass-like materials with refractive indices, EM-lenses are really Electro-Magnetic lenses 'made' of copper wires around a metal body with magnetic fields.
Can a sold conduct an electric current?
Solids can definitely conduct electricity -- like copper wires. It is a general property of metals.
What would happen if you put two wires next to each other and then run an electric current through each of the wires?
there would be a current. if you put your hand even near it, you could get seriously hurt. The real problem is that you cannot answer this question until you define what type of current is flowing through these wires. Direct current would be very stable and there is not much happening especially if the wires are straight and parallel to each other. If that is true you must also consider how close these parallel wires are to each other as this distance could be the difference between an interaction, or the lack thereof. If there is a pulsating direct current or an alternating current then there is an entirely different reaction. Some 50 years ago when telephone wires required to be close to each other for thousands of miles in some cases, and there were nothing like light signals for the transmission of voice, then there were massive "cut ins" of minute transformers every few miles, because these wires began to act like capacitors and there was "crosstalk" where conversations would be heard in different lines which were never truly connected. These pulsating direct currents radiated magnetic fields from these original wires into the wires of other connections which eventually caused these other wires to have currents generated in them, and it would actually cause the original conversations to be heard on the other line. This does not happen if a stable direct current is run through these same wires. Alternating current is so reactive in this way that the whole transmission of this current is decidedly designed around this current transfer potential. In the form of low voltage high amperage energy is generated then transformed into high voltage low amperage current that is transmitted in huge lines spaced far apart where voltages are as much as 144,000 volts with relatively low amperage. Until it comes into distribution centers where it is converted to 7,000 volts with relatively higher amperage and eventually converted into 480 volts at the pole to be distributed to industrial or even residential customers who use it as 480 volts or more likely 240 volts to use in some utilities such as stoves, heaters and air conditioners or down to 120 volts for everything else.
Why do wires in things like radios be soldered together but not just glued?
Because glue does not conduct electricity. You need the wires to be joined reliably to allow th current to flow, and soldering does that, and is quite easy to do.
What happens when an ammeter is connected wrong?
Ammeters have a low impedance, so if they are incorrectly connected in parallel to your load instead of in series, more current will flow through the circuit and the ammeter will almost act like a short. There is potential to burn our the ammeter.
