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Quiz_1c - σ>0< For each diametrically opposite pair...

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Physics 241 –Quiz 1c – Jan. 15, 2008 The upper half of a ring is uniformly charged with a positive charge density σ , whereas the lower half is uniformly charged with a charge density of −σ . What is the direction of the electric field at a point on the perpendicular axis and to the left of the ring as shown? a) to the right b) to the left c) up d) down e) E is zeo.
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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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