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Introductory Physics Homework Help
Finding the Electric Field at the Midpoint of two rings
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[QUOTE="haruspex, post: 5529200, member: 334404"] That would be the field 10cm from a point charge of 22nC. The charge here is distributed around a ring (not a plate). At the centre of each ring there is no field induced by that ring since the fields due to the charges around the ring point in all directions through the centre and, by symmetry, cancel. Consider a small portion of one ring, length rdθ, carrying charge q, where r is the ring's radius. And consider a point P distance x from the centre of the ring, along the axis of the ring. How far is P from the charge q? What is the strength of the field at P due to the charge q? In what direction does that field point? Alternatively, you may have already been taught a formula for the axial field due to one ring, in which case all you have to do is double it for the second ring. [/QUOTE]
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Introductory Physics Homework Help
Finding the Electric Field at the Midpoint of two rings
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