Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing

This Question is Closed

Faman39Best ResponseYou've already chosen the best response.0
@blues can you able to help me with this?
 one year ago

DevilonlineBest ResponseYou've already chosen the best response.1
A changing magnetic field induces electrical current in a wire and is the basis for electrical generation. Also an electrical current flowing through a wire creates a magnetic field and is the basis for most motors. In general a changing magnetic field creates an electrical field and a changing electrical field creates a magnetic field
 one year ago

s3aBest ResponseYou've already chosen the best response.0
Devilonline: Why is this relationship not perpetual?
 one year ago

DevilonlineBest ResponseYou've already chosen the best response.1
It is perpetual...its never ending like if u dont disturb the magnetic field or electric current it wont stop like in motors and generators
 one year ago

MashyBest ResponseYou've already chosen the best response.0
it is indeed perpetual.. and thats where james clerk maxwell comes into play.. he saw that they would keep on doing it. and hence he defined his electromagnetic waves!!
 one year ago

s3aBest ResponseYou've already chosen the best response.0
Devilonline, how does this not violate conservation of energy?
 one year ago

MashyBest ResponseYou've already chosen the best response.0
Cause energy is not lost in the process!
 one year ago

s3aBest ResponseYou've already chosen the best response.0
I was implying that it was created. But, I'm assuming it's not so ... where is that additional energy obtained from?
 one year ago

MashyBest ResponseYou've already chosen the best response.0
see initially some energy is required to create a disturbance.. infact.. in order to get an electromagnetic wave you need to accelerate charges (oscillating charges).. thats what happens when you switch on your bulb... the filament is heated to a high temperature... which causes the atoms to vibrate and they produce these electromagnetic waves.. so after a while the light diminishes right?..
 one year ago

s3aBest ResponseYou've already chosen the best response.0
If you mean as in the light bulb dying then, yes.
 one year ago

DevilonlineBest ResponseYou've already chosen the best response.1
No as in becoming dull a bit
 one year ago

MashyBest ResponseYou've already chosen the best response.0
exactly.. it dies off.. so the disturbance eventually dies off
 one year ago

DevilonlineBest ResponseYou've already chosen the best response.1
No wait ur saying wen we turn on a bulb
 one year ago

s3aBest ResponseYou've already chosen the best response.0
Devilonline, are you talking to me or Mashy?
 one year ago

DevilonlineBest ResponseYou've already chosen the best response.1
So then like it doesnt die off
 one year ago

DevilonlineBest ResponseYou've already chosen the best response.1
Sorry i shud specify...mashy
 one year ago

MashyBest ResponseYou've already chosen the best response.0
all waves.. eventually die off right??.. a ripple in water.. doesn't keep on going continuously.. theoretically it should.. but in reality it doesn't.. thats what I am saying!
 one year ago

DevilonlineBest ResponseYou've already chosen the best response.1
So the light doesnt diminish the waves do no?
 one year ago

s3aBest ResponseYou've already chosen the best response.0
Ok, what about reality prevents that ripple from continuing? Other ripples that cancel the wave out, etc? So, about an engine, are you saying it would get more and more powerful infinitely if the engine never broke?
 one year ago

s3aBest ResponseYou've already chosen the best response.0
Without giving it more energy.
 one year ago

MashyBest ResponseYou've already chosen the best response.0
the light DOES diminish... cause if you switch on teh bulb.. and you keep going farther and farther away.. the light becomes dull and finally at one point.. for all practical purposes you can't see the light at all!!
 one year ago

MashyBest ResponseYou've already chosen the best response.0
@s3a.. i have no idea what you are saying? :P
 one year ago

DevilonlineBest ResponseYou've already chosen the best response.1
Ooohhh!! I get it!! :D
 one year ago

DevilonlineBest ResponseYou've already chosen the best response.1
S3a same here i dnt get what u r saying
 one year ago

s3aBest ResponseYou've already chosen the best response.0
"It is perpetual...its never ending like if u dont disturb the magnetic field or electric current it wont stop like in motors and generators " This implies that if I give a motor some energy, I will never need to give it any more since it will (perpetually) make it on its own so the motor should go on forever until it breaks but, this doesn't seem to be the case with cards. You need to keep burning fuel (or whatever) to feed energy. So what am I missing? Also, sorry for being difficult to understand. I am presently tired but this topic striked my curiosity.
 one year ago

DevilonlineBest ResponseYou've already chosen the best response.1
That the more electromagnetic energy u need more elcectricity and a stronger magnet u would need otherwise it would have the same magnitude of power...in cars u press the accelerator and it accelerates by getting more power from the battery
 one year ago

DevilonlineBest ResponseYou've already chosen the best response.1
Like if u need a constant EMF source
 one year ago

MashyBest ResponseYou've already chosen the best response.0
s3a.. you have friction.. if there was no friction.. then what you said is right!!
 one year ago

s3aBest ResponseYou've already chosen the best response.0
Mashy, friction with the car parts?
 one year ago

DevilonlineBest ResponseYou've already chosen the best response.1
Oh yea eddy currents
 one year ago

DevilonlineBest ResponseYou've already chosen the best response.1
No eddy currents....u know what they are??
 one year ago

s3aBest ResponseYou've already chosen the best response.0
I don't know what eddy currents are.
 one year ago

s3aBest ResponseYou've already chosen the best response.0
What I meant by "car parts" is basically "not tires".
 one year ago

DevilonlineBest ResponseYou've already chosen the best response.1
Mashy the friction is cuz of the eddy currents right?
 one year ago

MashyBest ResponseYou've already chosen the best response.0
i mean we live in a world comprised of friction.. thats why we need to put in more energy.. !! if there was no friction.. then a car once set into motion.. will keep moving until it hits something :P.. and friction inside car parts, friction between tyres and roads.. even if there was only friction INSIDE car parts.. but not outside.. then also.. once car set in motoin
 one year ago

DevilonlineBest ResponseYou've already chosen the best response.1
Mashy also because of eddy currents
 one year ago

s3aBest ResponseYou've already chosen the best response.0
Mashy, I didn't understand what you said about if there was friction only INSIDE.
 one year ago

s3aBest ResponseYou've already chosen the best response.0
Ok so the bottom line is, energy can be created perpetually but it is lost to friction so the end result is you need to put more energy in manually?
 one year ago

s3aBest ResponseYou've already chosen the best response.0
Rather than relying on the "perpetual"ness.
 one year ago

s3aBest ResponseYou've already chosen the best response.0
I think a better word would be "obtained" rather than "created". Would it?
 one year ago

DevilonlineBest ResponseYou've already chosen the best response.1
Yesssss!!! I think i got confused about my concepts too by this question lol
 one year ago

s3aBest ResponseYou've already chosen the best response.0
Glad, I could do my part lol. :)
 one year ago

DevilonlineBest ResponseYou've already chosen the best response.1
Wait which grade r u in s3a?
 one year ago

s3aBest ResponseYou've already chosen the best response.0
I already did my first electromagnetic course (before university). Right now, I'm going to 2nd year software engineering.
 one year ago

s3aBest ResponseYou've already chosen the best response.0
Nonuniversity level by the way.
 one year ago

DevilonlineBest ResponseYou've already chosen the best response.1
OMG and im explaining this to u lol no wonder i got confused by ur questions....ohbwait u did ur electromagnetic course but u dont know about eddy currents O.o
 one year ago

s3aBest ResponseYou've already chosen the best response.0
Maybe I just don't know them by name.
 one year ago

s3aBest ResponseYou've already chosen the best response.0
Did you learn that in the first year undergrad course (US system)?
 one year ago

DevilonlineBest ResponseYou've already chosen the best response.1
Eddy currents (also called Foucault currents[1]) are electric currents induced within conductors by a changing magnetic field in the conductor. These circulating eddies of current have inductance and thus induce magnetic fields. These fields can cause repulsive, attractive,[2] propulsion, drag and heating effects. The stronger the applied magnetic field, or the greater the electrical conductivity of the conductor, or the faster the field changes, then the greater the currents that are developed and the greater the fields produced.
 one year ago

DevilonlineBest ResponseYou've already chosen the best response.1
Nope olevels (cambridge system)
 one year ago

s3aBest ResponseYou've already chosen the best response.0
Well, I don't remember the stuff well and I need to review but is that like getting the intensity of the induced emf?
 one year ago

s3aBest ResponseYou've already chosen the best response.0
I don't know the UK system. Do you have a school before University and after High school?
 one year ago

DevilonlineBest ResponseYou've already chosen the best response.1
What comes before senior year in highschool?
 one year ago

s3aBest ResponseYou've already chosen the best response.0
That just confused me more lol. In Canada, there is high school and then University but in Quebec there is high school > CEGEP/College > University
 one year ago

s3aBest ResponseYou've already chosen the best response.0
Do you have a middle school like that?
 one year ago

s3aBest ResponseYou've already chosen the best response.0
Again, I'm tired right now so sorry if I say stupid things.
 one year ago

DevilonlineBest ResponseYou've already chosen the best response.1
No like ok ill make it simple im talking about the 11 and 12th grade
 one year ago

s3aBest ResponseYou've already chosen the best response.0
Well, I technically did it in 13th if I remember correctly and I did the waves course before instead of after.
 one year ago

s3aBest ResponseYou've already chosen the best response.0
waves, optics, modern physics
 one year ago

DevilonlineBest ResponseYou've already chosen the best response.1
Oohk that makes sense now
 one year ago

DevilonlineBest ResponseYou've already chosen the best response.1
Yea we do it in the 12th grade
 one year ago

DevilonlineBest ResponseYou've already chosen the best response.1
Sorry i meant 11th
 one year ago

s3aBest ResponseYou've already chosen the best response.0
Oh, 11th I did kinematics, optics, stuff like that.
 one year ago

s3aBest ResponseYou've already chosen the best response.0
Anyways, this was nice but, I have to go fix a computer now so I'm going to go. Thank you both. @Devilonline and @Mashy
 one year ago

DevilonlineBest ResponseYou've already chosen the best response.1
Lol nice working with u lol tc
 one year ago
See more questions >>>
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.