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Electricity and Magnetism Questions?!?

I have a test tomorrow and I had a few questions on the review! Please help :) You don’t have to answer all….but it would be appreciated ;)
*Which of the following is the reason "soft" iron is used for the cores of electromagnets?
a. difficult to magnetize
b. easily magnetized
c. has no magnetic domains
d. permanent magnet

*In an electric motor, periodically changing the direction of current in the electromagnet can cause the axle to spin because
a. electromagnet loses magnetism
b. mechanical energy is converted to electric energy
c. moving electrons push the electromagnet in opposite direction
d. magnetic field reverses direction

* How can the voltage in a coil of wire be increased in the process of electromagnetic induction?
a. move magnet inside the coil of wire more slowly.
b. hold magnet stationary
c. move coil of wire slowly, and keep magnet stationary
d. move magnet inside the coil of wire more rapidly

* The process of generating an electric current by moving an electrical conductor relative to a magnetic field is called:
a. magnetization
b. electromagnetic force
c. electromagnetic induction
d. alternating current

* How are fossil fuels used to generate electrical energy?
a. heat from burning fuel spins magnets inside an electrical motor
b. heat from burning fuel creates steam that spins a turbine
c. heat from burning fuel causes an electric motor to produce a current
d. heat from burning fuel creates steam that turns a transformer

Thanks so much!! Again, you don’t have to answer all…and these are only the one’s i didn’t understand! Please help :)

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Magnets affect tasers?

A taser, electrical weapon used for self defense. I’ve been told 2 things (I’m talking about hand held short ranged contact stun guns, not the shooting ones), one, that the other person’s body acts as the last wire of the tool and that gives him the shock. I’ve also heard that the electrons just skip right over from peg to peg, creating a small ‘beam’ of electricity.

Now my question is: If you had a magnet of some sort placed below the beam of electricity, with an opposite charge (if possible), would the electricity project outwards? I ask this for 2 reasons: 1, I’m just curious, and 2: I love electricity and lightning, and I think it would be epic if you had some sort of ‘lightning dagger’ :3

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Can humans control the electrons of their bodies?

I saw some people who can float lite things such as a bit of paper or a ping pong ball, then they say that they control their electrons of their bodies causing static electricity to magnet lite things, when we ask them how they control their electrons they answer : by concentration or "working your body, soul, spirit together" or something like that.
i mean what the hell, is that true????

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How does a magnet generate its magnetic field without outside electrical input?

Since electricity and magnetism are intimately linked, I’m wondering how it is exactly that a magnet which is not receiving any outside electrical current generates a magnetic field. Does the magnet itself generate its own electric current? Or, am I missing something? Is there something more basic.

I mean, I know that running electricity through a coil of wires generates a magnetic field. So, when you’re not actively running electricity through or around a magnet, why is a field still generated? Wouldn’t the field collapse once the electric field that created the magnet is removed? Or is there still a circulating electric current inside the magnet. If so, how can that be?

If I had to theorize, I’d say the magnetic field is coupled with an electric field, and a magnet’s atoms are aligned in such a way as to let electrons flow through the magnet in a natural circuit, thus generating the corresponding electric field? Am I off base?

Physics gurus only? No one-liners. List sources…? :)
I’m wondering if the externally generated electrical current pulls the atoms into an alignment such that electrons are allowed to flow in a circuit within the magnet, thus generating the external magnetic field, even after the external current is taken away, the atoms are still in alignment such that the electrons of the magnet can still flow?
tbolling2

Okay, I’ve heard similar explanations before, haven’t entirely gotten them.

So, we’re saying that the electrons orbiting the nucleus give off or create a magnetic field, and enough of them together in the same basic alignment give off a bigger magnetic field?

So, one could say perhaps that the magnetic field is proportional to the difference of the total orbits in the magnet, IE, if more are orbiting one way than the other, you’ll get a field, wherreas if equal amounts are orbiting oppositely you’ll get no effect because they cancel each other out?

So could we say something to the effect that the magnetic waves or lines of force are either reinforcing or interfering with each other, much like in interferometry? IE, if you get waves moving in tandem they tend to reinforce one another and make themselves larger (or combine to make one larger wave), whereas if you get waves that are opposite they neutralize each other?

This begins to make more sense. Thank you.
However, if the electron itself is generating a magnetic field on its scale, where does its field come from? IE, is an electron magnetic? If so where does its field come from? Is an electron the smallest indivisable unit that can be used to generate a magnetic field or is there something more basic that creates the field of the electron? Or is it simply the electron’s motion around the nucleus that generates the field? If so, how? Does the electron somehow drag space to create a wave in it? Or what? Or are there charges circulating within the electron that cause it to have its own magnetic field? IS the field scaleable to smaller dimensions, or is the electron the smallest thing that generates a field? So many questions so little time.
God, I love that statement! It speaks volumes to our current understanding of physics…

"A lot of things are dictated by uncertainty." In the realm of physics education, ain’t that the truth…?

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How would You grade my paper on nuclear fusion?

Nuclear fusion reactions that occur in our Sun produce huge amounts of energy. Is there any way to harness nuclear fusion reactions here on earth to produce electricity? No commercial nuclear fusion power plants currently exist, but some researchers hope that technologies can be invented to bring fusion power into production in an environmentally friendly way. Many governments have the same hope and have invested billions of dollars in pursuit of this dream.

The centre of our Sun is very hot-about 15 million degrees celsious. For many decades, researchers have looked for a practical way to recreate the conditions at the centre of our Sun. They have produced extremely hot temperaturs during nuclear explosions, but this is not a practical way of producing electricity. An added challenge is that no container made of matter can contain gases that are as hot as the centre of our Sun. Any type of container would melt long before reaching those temperatures. However, there is another way to contain hot gases- with a strong magnetic field.

How can you use a magnetic field to hold gases? hot gases lose electrons, turning all the atoms into ions. An ionized gas is called plasma.

In a fusion power reation, a magnetic filed traps hydrogen plasma. One reactor design uses an electromagnet posiitoned in the shape of a doughnut. The hot plasma stays inside the doughnut and away from the magnets used to generate the magnetic field. Currently, a number of existing experimental facilities are suing this technology.

Given thse tremendous challenges as well as huge development costs, why even bother to try to build a fusion power facility? If it could be made to work, fusion power is expected to have a number of advantages. The materials needed for fusion-isotopes of hydrogen-are as plentiful as the oceans themselves. Also, the products of nuclear fusion are expected to be stable isotopes, meaning that there might be no radioactive wastes to worry about. Finally a small amount of fusion produces a tremendous amount of enery.

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When was electricity first invented, AC or DC doesnt matter?

I just care when the first battery was made, how was it made, if it wasnt a battery, what was it, energy needs to come from somewhere, where did it come from. Who is the first person that harvested this energy, if it was done with electromagnets, where did the electrons to make that magnet come from.

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How can a magnet repel or attract an electron ray?

In a cathode ray tube, if you put a magnet near the ray, the electron ray seems to be repelled or attracted to it depending on which side you put near it.

Since magnets are magnetized and electrons are electrically charged, and magnetism and electricity are not related, how can a magnet attract an electric particle?

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Can a permanent magnet repel electricity flowing through a wire?

I am making a science project and for safety, I want to know if a permanent magnet can repel the electrons in a wire. The wire is attached to a 9 volt battery and has a constant flow of electricity. Would putting up a magnet next to this wire cause even a few electrons to break free and be released into the air IF the south pole of the magnet were put next to the wire. A second part of the question is what charge does the north pole of a magnet have? Positive or negative? I know some guy who proved the existence of electrons did something like this but… you know… never paid attention in science class. thanks.

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How does a coal power plant make electricity?

use the words…
turbine, generator, magnets, coils of wire and electrons
i needdd helppp! i’m at school right now and i cannot find anything so i resulted to yahoo answers

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need help on questions that have to do with magnets and magnetism?

Explain how electrons moving through a wire create a magnetic field and describe the magnetic field. How can electrons be made to move through a wire using a magnetic field? How can electricity and magnetism be used to generate a force?

Thanks in advance! 10 points heading YOUR WAY!

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