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May 28 at 3:59 comment added JEB @shiguoxu yeah, I had grifth too, it's ayiat. But when I say what is that, I mean what is it? is it a little l or an I or i or a what?
May 27 at 21:42 vote accept guoxu
May 27 at 21:36 comment added guoxu @JEB The book I used is "Introduction to Electrodynamics" by David J. Griffiths, and the distance in it uses $\imath_1$ as the distance variable. It seems that next time when asking questions on this website, I should use more common symbols.
May 27 at 15:49 answer added JEB timeline score: 1
May 27 at 15:36 comment added JEB what is that distance variable? Why not use $\vec r'$?
May 27 at 14:57 answer added march timeline score: 2
May 27 at 14:14 comment added The Photon Suppose you have two of these point charges, say $q_7$ and $q_{23}$, that are both located at a distance of 3 cm from Q (but in different directions)...
May 27 at 14:07 history edited guoxu CC BY-SA 4.0
added 1 character in body
May 27 at 13:58 history asked guoxu CC BY-SA 4.0