<p>I skipped internal resistance but ^ makes sense. </p>
<p>Electric field between 2 parallel plates is constant, for sure. </p>
<p>I confirm that it's 2 amps. </p>
<p>What is the efficiency question? (1991's number 49)</p>
<p>Backed up:</p>
<p>PHYS345</a> Real Batteries and Battery Testers</p>
<p>"Thus if no current flows through a battery, its terminal voltage in that case will be identical to its emf."</p>
<p>It was like which combination has least efficiency</p>
<p>1000j 30%
1000j 45%
... etc.</p>
<p>i think it was 1000j 30%</p>
<p>Yes satsux, thats right.</p>
<p>Can anyone confirm the Electric Field One? How can it be constant if E=V/d. Or does this mean that V also increases, since Q=CV, and C decreases, so V must increase</p>
<p>hey, so based of the answers posted here I already have like 20 wrong. Can i still break a 600?</p>
<p>all waves undergo diffraction--did that question also include answer choices like absorption, reflection, etc? or am i just remember a practice test question?</p>
<p>now i have a raw score of 66/75. grr. 2 omit and 5/6 wrong. thats -9. so what do u think the curve is?</p>
<p>btw thnx 1991 for the list, lol</p>
<p>grade inflation.. if you have that raw score i'm 100% sure u get 800</p>
<p>well there are 25 more questions lol :P</p>
<p>wow im at 8 wrong and 4 blank now
thats -14 which puts me at 61
uh oh.... lol how close is that to 800??</p>
<p>ur on the borderline. lol =P</p>
<p>omg this sucks so much i really hope the curve is at -16 like it was in that collegeboard released test in the big fat all subject tests book</p>
<p>i think 61 is 800.until now we have 52 questions with that with the emf which i think that switch open is correct but i am sure it had some easy ones in the begining with u vs time i think 2 more,and then 2 with lens and plane,and then there were two more we can solve now.
1.tho one with the vertical polarizer and then the horizontal.i put light is horizontaly polarized but i think its wrong.
2.the 2nd is the one with e.since e=v/d i think it cant be a straight line..what do you think
does anyone remember the question i mentioned before about internal heat??</p>
<p>im at -10 raw score already lol</p>
<p>well i dont hae the cb subject tests book but i didnt know there could be a test for physics with a 59-->800 curve.kaplan had 63 as the minimum.but compared to this test it was 100000000x easier.was the cb test easier than ths one??</p>
<p>the EMF question is definitely when the batery is unplugged</p>
<p>Even if the battery is unplugged, if r is large the EMF will not equal the measured voltage. Wasn't one of the choices that r(internal resistance) is small? If r is not small none of the other choices will give EMF = measured voltage.</p>
<p>when we did an experiment to find the r and the EMF, we specifically unplugged the battery because thats when your V drop=EMF</p>
<p>ones i definitely got wrong
-wire and plane w/ circular current (skipped)
-wires coming out of plane rotating which one had the most current or something (skipped)
-battery and resistance question
-where the wave was going up
-the graph of distance b/t plates vs. electric field
-bird in the pool question
-question about traveling at .9c</p>
<p>ones im not sure
-2q? i dont remember what i put</p>
<p>ugh! so much magnetism!</p>
<p>how many wrong can i get?</p>