A disk of radius 30 cm carries a uniform charge density ?. (a) Compare the approximation E?=
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A disk of radius 30 cm carries a uniform charge density ?.
(a) Compare the approximation E?= 2?k??with the exact expression (Equation 23-11) for the electric field on the axis of the disk by computing the fractional difference ?E/E?? x/??x2+R2 for the distances x = 0.1, x = 0.2, and x = 3 cm.
(b) At what distance is the neglected term 1% of 2?k? ?
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a Evaluate E E x x 2 R 2 for x 01 02 a...View the full answer
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