A disk of radius r= 70 cm has a uniform surface charge density a= 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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