Originally posted by: jmcoreymv
Anyone else have the Phys C test today? I thought it was relatively tough. WTF was up with that charged cloud distribution problem?
hm...all you have to do is use Gauss's law. In part a), since you're outside the cloud, you can just call the whole distribution Q and solve. Part e (? the last one) is slightly harder, as you have to subsitute pV=q in order to solve it. From a), potential difference (voltage) is simply integrating part a). Part b) was an explanation thingy...but I totally forgot what. Part c) was multiplying A by q+ or q- (I forgot what particle was being accelerated) and setting that equal to 1/2mv^2. Forgot what part d) is though..oops.
I didn't think it was too bad. I'm pretty sure I 5-ed the mechanics. Though, I totally blanked out on the last E&M Free Response problem (who would've thought that the plane was moving FORWARD? God I'm a moron), so that wasn't too good...4 or 5 on E&M, I'd say.