19 Two charges q: " -3.0 pC and q2 = -8.2 pC are separated and experience a force of magnitude 2:3 N. By what distance are they separated? Select one alternative: 0 0,05 m 0 0.02 m 0 0.35 m 0 0.31 m 0 0.10 m Reset Maximum marks: 120 Two helium nuclei (each nucleus has mass = 6.64 x 10 -27 kg and charge = 3.2 x 10 -" C) are accelerated from rest, from plate A to plate B by a voltage of 2500 V. With what speed will the hellum nuclei strike plate B with? Plate A Plate B 2500 V Select one alternative: 0 4.91 x 105 m/s Q 2.41 x 105 m/'s D 241 x 10 m/'s 0 141 x 10- m/'s 0 5.55 x 105 m/'s21 Anna left her lamp on over night from 10 PM to 8 AM. She wants to find out how much energy she has wasted. She noticed the label on the lamp states 40 W and 120 V. How much energy did she wasto? Select one alternative: O 1.44 x 10- J O 1.44 x 10* W O 1.44 x 10" W 21600 C O 18000 W Roset Maximum marks: 1