- #1
Ascendant78
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Rather than try to explain what I am talking about, I am going to link to an image of it below. My question is in regards to the negative value I marked in the answer (the one for the surface charge density for the inside of the outer shell). While I get the concept that it would be negative in this type of scenario, I don't know exactly why? I am assuming it has something to do with the positive charge facing outwards and the surface area being analyzed facing inwards, but I am curious about how this pops up in the math so that I will know on more complicated problems that won't be so obvious?