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A disk of radius r= 70 cm has a uniform surface charge density o= 117.2 nC. Calculate the electric field (in units of kN/C) at point P that lies along the central
perpendicular axis of the disk and a distance 30 cm from the center of the disk. use k. = 9x10° N m2/C2
Select one:
A. 4.02
B. 2.60
C. 2.01
D. 8.03
E. 8.70

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