<p>For E&M 1E I was interested in how you all were coming up with odd answers as opposed to the general equation itself. In terms of the negative derivative of potential you would have kQ/r. If you take the negative derivative of that you would have something like kQ<em>deriv(1/r) or kQ</em>deriv(r^-1) which would end up being kQ/r^2. Either the general equation for the electric point charge field is correct or the potential solution is incorrect. Interestingly enough each dQ is a distance r from point P. Just some general thoughts as I’ll be taking the form B this friday. I hope I’m ready.</p>
<p>JDong can you please elaborate on some of your E&M solutions. Especially E&M 3. Thank you.</p>