Question

Al AL no, 16 form Texas A&M University-Corpus Christi Summer II 2015 Term 5. A charged dust particle of mass 3.0 g suspended in air directly 2.lem below a fixed point charge of is Q- 0.58 nC. What is the charge of the dust particle? (H) 0.92 (A) 2.5 (C) 11.2 uC (D) 11.2 uC released 6. A metal sphere of 2 g mass has a positive charge of 10vc and is held in the origin, The sphere is from rest in a uniform electric field of 100 kN/C at what position it speed of 5m/s? 0,025m) reaches a (0m: (A) (0.025m; 0m) (B) (-0,025m; 0m) (C (0m; 0.025m) 7. Figure 3 shows equipotential lines of an electric field. What sequence of points is in correct order of negative potential gradient (from highest potential to lowest potential)? A, B, C, D, E, F (B F, E, D, C, B, A. D, E, F, C, B, A i I (E) C-F, E B, D-A Figure 3 roasting a turkey an 8. If electrical energy costs 13 cents, or so.13, per kilowatt-bour, then what would cost of $0.086 electric oven for 3.0 h ifit carries a current ofi0 A at 220 (E) (D) $0.858 (C $8.58 (B) S85.8 (A) $858 isolated charge is correct? 9. Which of the following statements about the electric field of a single (A) The direction of the field doesn't depend on the sign of the charge. the charge. (B The direction of the field doesn't depend on the position relative to charge. (C The magnitude of the field doesn't depend on the distance from the (D) The magnitude of the field doesn't depend on the magnitude of the charge. (E) The magnitude of the field doesn't depend on the sign of the charge. 10. A capacitor is designed so one plate is large and another is small. the plates are connected to a that If battery, which plate with store a greater charge? equal, but opposite (cy The plates with have (B) Large plate PHYS 2426-University Physics II B 2 (A) Small plate

Answer 1

answer 1)

option B)

solution:

$F_g = F_e \Rightarrow gm = k_e\frac{q_1Q}{r^2}$

solving for q1 :

$q_1 = \frac{gmr^2}{k_eQ} = \frac{(10m/s^2)(0.003kg)(0.02m)^2}{k_e(-0.58\;nC)} = \boxed{-2.5\;\mu C}$