<p>Talk in general terms until the embargo is lifted. </p>
<p>I found the test very hard, harder then any of the practice tests i ever did, i was scoring in the 750-800 range in barrons and this test was just out of the world. I hope i'm not the only one who found it difficult. :X</p>
<p>yeah i found it hard too, i cant finish it on time and omit the last 5 T_T
omitted 10 in total :(</p>
<p>many materials were not in AP Physics B…
did any1 remember question number 13, it is centered with +Q and a +q on circular path; which graph did external force does greatest work?</p>
<p>the one where the charge was moving toward the center because it requires a lot of energy to more a positive charge closer to another positive charge. At least that’s what I put. BUT IT WAS A REALLY HARD TEST</p>
<p>Hoping the curve is humongous</p>
<p>For the circle question with charges q and Q, didnt all of them do the same NET work because they all started and ended at rest and net work is change in KE</p>
<p>and for the transformer one, I wished one of the answers was robots in diguise, like i had no clue haha</p>
<p>Wait! So this test was more difficult than the barron’s practice tests? I’m taking it in june. I guess i’m pretty much ****ed then.</p>
<p>I thought that the net work was 0 for choices 1 and 3 because they were traveling in centripetal motion and Work = 0 for centripetal motion</p>
<p>@Nynjal: Yup for the net force on the charges one i made the same choice aswell, Hope its right.</p>
<p>midtriplet…yea the half circle and full circle were no work cuz electric potential (work) doesn’t change.</p>
<p>and what about the second question on the diagrams : which diagram has the highest potential (or something like that)?</p>
<p>i think highest potential was the one with the charges close together</p>
<p>yep that’s right…what did you guys put for the one that had a particle entering a spinning sphere and it asked what could be found about the particle…the answer choices were like mass, frequency, speed, and two other things…</p>
<p>one other choice was charge but i omitted it :(</p>
<p>imaboss: i put speed for that one</p>
<p>and i omitted the transformer ques… never learned it</p>
<p>transformer was the one where the first coil causes an current in the second foil…faraday’s law (thank god I took physics C)</p>
<p>oh yea and i put speed too :)</p>
<p>For the circle one I’m pretty sure the most work is done when you move the charge closest.</p>
<p>V=ΔU/q</p>
<p>W = ΔU = qV = kqQ/r</p>
<p>Since r is smallest when it is closest, it makes work increase. I said only “I.”</p>
<p>yes cjr605, we already established that…</p>
<p>what’s the curve for physics usually?
oh and i used PR and barron’s and the PR was actually much harder than the barron’s O__O which is usually not the case…actually i’m going to take the ap physics b test too (for “fun”) this month and the PR is harder than the barron’s</p>
<p>a transformer is like when there are two coils of wire with differing loops …the changing magnetic field created by the current in the primary coil induces a current in the second coil</p>