Question

1 & 2

1,(7 points) Three point-like charged objects lie along the x-axis, One has a charge of +154 nc and is located at the origin; one has a charge of +21.9 nC and is located at x1.78 cm; the third has a charge of -16.2 nC and is located at x +1.43 cm. What is the magnitude of the net force on the charge at the origin? [mN- 0.001 N.] a) 1.40 mN b) 12.4 mN c) 20.5 mN d) 3.18 mN e) 42.6 mN Ans. 2.(6 points) A very small ball has a mass of 12.0 mg and a charge of +28.5 nC. What magnitude uniform electric field, direct upward, will exactly balance the weight of the ball so that it can be suspended motionless above the ground? a) 2.79 kN/C b) 1.06 kN/C c) 5.27 kN/C d) 4.13 kN/C e) 3.64 kN/C Ans

Answer 1

2l anc 6.2nt 1.43um 9 2 143xio F 20.5 mN רת 28.5 xlo7