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Consider a thin, spherical shell of radius 12.0 cm with a total charge of 28.8 �C distributed uniformly on its surface.

(a) Find the electric field 10.0 cm from the center of the charge distribution.

magnitude ______________ MN/C

(b) Find the electric field 19.0 cm from the center of the charge distribution.

magnitude _______________ MN/C

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(a) magnitude = 0 MN/C (because no charge is present within 10cm)

direction = the electric field is zero

(b) magnitude = kq/r2 = 9 x 109 x 28.8 x 10-6 / (12 x 10-2)2 = 1.8 x 109 N/C = 1800 MN/C

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