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, 21.81 … A uniformly charged disk like the disk in Fig. 21.25 has radius 2.50 cm and carries a total charge of 7.0 X 10-12 C. (a) Find the electric field (magnitude and direction) on the x-axis at x = 20.0 cm. (b) Show that for x >> R, Eq. (21.11) becomes E = Q/4T60x“, where Q is the total charge on the disk.

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(c) Is the magnitude of the electric field you calculated in part (a) larger or smaller than the electric field 20.0 cm from a point charge that has the same total charge as this disk? In terms of the approximation used in part (b) to derive E = Q/4T60x for a point charge from Eq. (21.11), explain why this is so. (d) What is the percent difference between the electric fields produced by the finite disk and by a point charge with the same charge at x = 20.0 cm and at x = 10.0 cm?

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