<div id=\"MathJax_Message\" style=\"display: none; \"></div><p>Three charges are

Question

<div id="MathJax_Message"></div><p>Three charges are on a 2D plans:&nbsp;</p><p><br></p><p>1. -8?C at (20,5) mm&nbsp;</p><p>2. +12?C at (40,-8) mm&nbsp;</p><p>3. -2?C at (-2,-4) mm&nbsp;</p><p><br></p><p>Answer the following questions:&nbsp;</p><p><br></p><p>1. If these are the only particles on the plane, what is E-field at the origin?</p><p>2. &nbsp;What is the net force on the +12<span class="Apple-style-span">?C charge in polar coordinates?</span></p>

Explanation / Answer

E-field at (0,0) = [-8(20i+5j)/(202+52)3/2 + 12(40i-8j)/(402+82)3/2 - 2(-2i-4j)/(22+42)3/2 ] x 9 x 109

Net force on +12C = 12C [9 x 109 (-8C{(20i+5j) - (40i-8j)}/(202+132) - 2C{(-2i-4j) - (40i-8j)}/(422+42))]

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