GR9677 #71



Alternate Solutions 
Moush 20100915 18:11:51  For a completely unphysical approach, see below. To actually learn something, see other posts.
I got this via simple guessing strategy.
(L/d) shows up in 3 answers; and only once, eliminating C and E.
Vq shows up twice in the remaining answers; 2Vq once, eliminating D.
just looks wrong, eliminating B.  

Comments 
deneb 20181008 04:12:51  You have to divide both sides by , and since is just the original velocity given in the problem, that\\\\\\\'s how you get in the denominator   allenabishek 20170803 19:29:24  Why is it that in the solution to find dy, the first term is ignored ?? the kinematic equation is actually y = v0t + 0.5at^2. why is the first term ignored?   dipanshugupta 20170322 14:15:07  Well A looked more beautiful.   hooverbm 20121102 09:15:49  Found a super fast way of doing this.
The charge is obviously acted upon by a force due to the electric field.
For parallel plates, the acceleration due to this force only acts along the ydirection. We know:
F = qE (V = Ed > E = V/d)
ma = qV/d
a = qV/md
The angle of deflection should be proportional to this term, leaving only answer A   soloeclipse 20101104 16:31:02  All of the answers are dimensionless.
SonOfHam 20101112 22:21:52 
+1

kevintah 20151012 19:03:36 
lol, this sucks!

  shjung84 20101014 21:55:12  See dimension
The only possible choice is A of which argument indicates no dimension.   Moush 20100915 18:11:51  For a completely unphysical approach, see below. To actually learn something, see other posts.
I got this via simple guessing strategy.
(L/d) shows up in 3 answers; and only once, eliminating C and E.
Vq shows up twice in the remaining answers; 2Vq once, eliminating D.
just looks wrong, eliminating B.
ryanmes 20181024 01:19:02 
I did the same thing... it works

  dstahlke 20091009 10:57:43  The diagram threw me off here... The deflection of the final velocity is but the dotted lines on the diagram form a triangle suggesting they want which I think would be equal to . That wasn't one of the options so in this case I suppose guessing the nearest answer would work.   haro 20070413 04:25:01  It is simplier to think of tan =
Jeremy 20071015 12:01:19 
I agree. From use , , and finally, the equation you gave: .

walczyk 20110405 13:27:12 
this works well except i don't see where the comes in?

  yosun 20051109 14:42:33  tachyon: thanks for the typoalert; it has been corrected.   tachyon 20051109 13:36:53  typothe correct answers is A  

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