Unformatted text preview: σ>0 < For each diametrically opposite pair of infinitesimal charges on the ring, the component of E that is parallel to the ring axis cancel out, leaving only the perpendicular components. Among this remainder, the component perpendicular to this sheet also cancel out by symmetry. This leaves only the net downward component....
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 Spring '08
 Wei
 Charge, Electric charge, perpendicular axis, positive charge density, diametrically opposite pair, net downward component

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