Cracking the AP Physics B exam - Princeton Review - clarification

Test Preparation AP Sciences
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<p>Cracking the AP Physics B exam - Princeton Review</p>

<p>Pg 202 - 1) a - Expresss the magnitude of q in terms of Q. I get Q/sqrt2 but in the solution in the book (pg 407) is q = Q/2sqrt2</p>

<p>Can anyone guide me? Is there any error in the book? Or have I made any mistake.. Can you please guide me through the steps...</p>

<p>Thank you so much for your help.</p>

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<p>Bump - please help!!! Homework due tomorrow.</p>

<p>Thanks</p>

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<p>Post the question.</p>

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<p>The question is this</p>

<p>[Cracking</a> the AP Physics B & C Exam … - Google Bücher](<a href=“Cracking the AP Physics B C Exam, 2004-2005 Edition - Steven A. Leduc - Google Books”>Cracking the AP Physics B C Exam, 2004-2005 Edition - Steven A. Leduc - Google Books)</p>

<p>Really appreciate your help in solving this (cant figure out why my answer is not the same as the one given in solution)</p>

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<p>Pick one of the +Q charges. Calculate the electrostatic force exerted by each charge (-q, -q and +Q) on the +Q you picked. Add those three together and set it equal to zero (since net force is zero). Solve for q.</p>

<p>Try doing that; if you don’t get the right answer, then post up your work and I’ll see if I can find the problem.</p>