A disk of radius r= 70 cm has a uniform surface charge density o= 79,5 nC. Calculate the electric field (in units of kN/O atpoint 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/C²Select one:CA 1.77OB. 1.36OC. 5.45OD. 2.72CE 5.90Nex! page09:15 The velocity of a particle (m 10 mg, q = - 4.0 uC) at t 0 is 20 m/s in the positive x-direction. If the particle moves in auniform electric field of 20 N/C in the positive x-direction, what is the particle's velocity ( in m/s) at t= 13.6 s?Select one:OA-34.40OB. 74.40OC 128.80OD. -88.80OE 47.20Next page

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