C) 3. D) 4 6 The answer depends on the test charge, whlch is not given. 5. A neg
ID: 1864940 • Letter: C
Question
C) 3. D) 4 6 The answer depends on the test charge, whlch is not given. 5. A negative-2.0 pC charge is placed at the origin (lower right i the sketch . A identical charge is placed a distance a = 0.2 m to the left of the origin on the-x axis. Apsitive + 2.0pCcharge i on the y axis. Find the magnitude and direction (relative to the positive x-axis) of the net force on the charge at the s placed 0.3 m from the origir origin. +2 HIC A) 2.0 N, 45 B) 1.3 N, -45° C) 0.6 N, 225 D) 0.6 N, 45 E) 1.3 N, 135 -2 HC - 2 HC 6. A small conducting ball has a mass of 3.0x 101 kg and a negative charge of-300 yC. What electric field an direction are needed to exactly balance the weight of the ball? (assume g 9.8 m/s)? A) 9800 N/C up B) 9.8 N/C down C) 0.49 N/C down D) 10 N/C up E) 1630 N/C down mg 7. A particle whose mass is 10.0 grams and whose charge is 10 nC is released from rest when it is 20 cm from a second particle of charge 10 nC. Find the magnitude of the particle's intial acceleration. Neglect any gravitational forces. A) 2.25 x 103 m/s B) 0.015 m/s C) 15 m/s D) 0.011 m/s E) 0.23 m/s P.Explanation / Answer
7) Force = Kq^2 / r^2
= 9*10^9*(10*10^-9)^2 / 0.2^2
= 2.25*10^-5 N
acceleration = F/m = 2.25*10^-5 / 10*10^-3
= 2.25*10^-3 m/s^2
so option A) is the correct answer
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