<p>[Problem</a> Set - Induction - Physics 108](<a href=“http://www.wellesley.edu/Physics/phyllisflemingphysics/108_p_induction.html]Problem”>Problem Set - Induction - Physics 108)</p>
<p>look at problem # 7</p>
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<p>That’s another example in which the magnetic flux does change, because the loop moves from outside the field to inside it, increasing the amount of field passing through the loop. If the loop is already inside the field when it moves, the flux does not change.</p>
<p>it sucks because you’re wrong on all three of those questions…there’s no induced current, quasars were present near the beginning of the universe, and magnetic fields are used to focus the electrons.</p>
<p>and also, does anyone recall the 3 or so questions in the beginning involving the loop in the magnetic field?</p>
<p>[A</a> New View of Quasars | Universe Today](<a href=“http://www.universetoday.com/2006/07/25/a-new-view-of-quasars/]A”>A New View of Quasars - Universe Today)</p>
<p>[Particle</a> accelerator - Wikipedia, the free encyclopedia](<a href=“http://en.wikipedia.org/wiki/Particle_accelerator]Particle”>Particle accelerator - Wikipedia)</p>
<p>edit: just stop. you’re 100% wrong, and neither of those links, which I regret reading, prove otherwise.</p>
<p><a href=“Supporting Students from Day One to Exam Day – AP Central | College Board”>Supporting Students from Day One to Exam Day – AP Central | College Board;
<p>straight from collegeboard
look at number 3, this is the SAME concept
the magnet produces a perpendicular magnetic field to the square wire. When the magnet is “turned on” a current is induced in the wire due to the magnetic field. It even tells you that the current in 4A. The arrows even show the direction of the current.</p>
<p>choklitrain, since when have you known so much about physics?</p>
<p>if you didn’t doubt yourself, you wouldn’t even have read those links. </p>
<p>w/e we will see what happens when scores come out.</p>
<p>that is because ‘upon the magnetic field being turned on’ there is a change in magnetic influx whereas on the June subject test, magnetic field stays the same</p>
<p>you’re still wrong. the magnet isn’t “turned on,” the loop’s power supply is turned on. and they’re not even talking about an INDUCED current like they were on this month’s test. just stop defending your wrong answers, it’s ruining the thread.</p>
<p>I will take a picture from my princeton review.
some friendly argument please. ok? i don’t want it to get hostile. If you can prove i’m wrong with links, i’ll be happy to look at them and admit i’m wrong ok?</p>
<p>^ It’s not my job to teach you this stuff. I would, however, like you to stop defending wrong answers just to make yourself feel better.</p>
<p>[Image</a> - ■■■■■■■ - Kostenlose Bild- und Videospeicherung und gemeinsame Nutzung von Fotos](<a href=“http://de.■■■■■■■.com/r/s6lo2t/5]Image”>http://de.■■■■■■■.com/r/s6lo2t/5)</p>
<p><em>look at part b</em></p>
<p>explanation in the answers:
V=IR, I=0.04A. The direction is given by Lenz’s Law. Current flows in order to oppose the change in the magnetic flux. Because there is suddenly a new flux “in” current flows to produce an outward flux. This would be in the counterclockwise direction. </p>
<p>and it’s not like a the current stops suddenly as it makes its way through the magnetic field. The current continues to flow in the counterclockwise direction.</p>
<p>“It’s not my job to teach you this stuff”</p>
<p>and geez choklitrain, haven’t you heard about how top colleges don’t appreciate arrogance in their applicants?</p>
<p>more edit:
and the only way there is NO induced current is if the wire is moving parallel to the magnetic field because there is no way to apply the right hand rule or lenz’s law</p>
<p>and would someone be kind enough to link be a website explaining that quasars were there since the beginning of the universe and don’t red shift.</p>
<p>I think the answer about the quasars is bc they were such and such billion lightyears away…it takes the light as long to travel as since the beginning of the existence of the universe. So if we are recieveing the light now, they existed then.</p>
<p>^oh i see, do you remember the other answers? </p>
<p>(see what constructive discussion does? instead of ad hominem attacks? ahem)</p>
<p>emf is electromotive force not induced current.</p>
<p>and regarding the picture that you posted (thanks for your effort by the way)
it enters into the field, whereas in the question on the exam it started in the magnetic field and does not move out of it, which means no change in magnetic influx</p>