A disk of radius 30 cm carries a uniform charge density s. (a) Compare the approximation E = 2pks 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/ vx2+R2 for the distances x = 0.1, x = 0.2, and x = 3 cm. (b) At what distance is the neglected term 1% of 2pks ?
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