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When a second point charge q2 is placed a distance d

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Unformatted text preview: ± 47. A point P is located at a distance d to the right of a positive point charge +q1. When a second point charge q2 is placed a distance d to the left of the first charge, the magnitude of the electric field at P doubles. Which of the following are the two possible values for q2? a. +q1 or -2q1 b. +2q1 or -3q1 c. +2q1 or -6q1 d. +4q1 or -12q1 48. A 10-4 charge is moving at 105 ms-1 parallel to a 4 T magnetic field. The magnitude of the force on the charge is: a. 2 N b. 20 N c. 40 N d. None of the above Page 7 of 15 ©Prep101 49. A particle with a mass of 6.64 × 10-27 kg and a charge of +3.20 × 10-19 C is accelerated from rest through a potential difference of 2.45 × 106 V. The particle then enters a uniform 1.60 T magnetic field. If the particle’s velocity is perpendicular to the magnetic field at all times, what is the magnitude of the force exerted on the particle? a. 0 N b. 1.14 × 10-10 N c. 6.55 × 10-10 N d. 7.87 × 10-12 N Questions 50-52 refer to the figure below A B Two balls of the same volume are immersed in water. In system A, the ball is being held under water by a string. In system B, the ball is being prevented from sinking to the bottom by as string attached to the top of the box. 50. Which of the four free body diagrams correspond to system A? (T = tension in string, W = weight of ball, F = buoyant force) a. F T F b. W W c. T d. T F W W F T 51. You are told that ball A and ball B are suspended in the same liquid, and that they are the same mass. What is the tension in the string? a. T > 0 b. T = 0 c. T < 0 d. It is impossible to tell from the given information 52. If we exchange the water in the figure for another fluid of density ρnew, what is the condition on ρnew if we want to observe the same behaviour as is exhibited in figure 1, what must be the density of the new liquid? a. ρa > ρnew > ρb b. ρa < ρnew < ρb c. ρa = ρnew = ρb d. ρnew = ρwater 53. Which of the following is true for an ideal stationary fluid? a. The density increases linearly with depth b. Only the fl...
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This note was uploaded on 03/23/2011 for the course CHEM 100 taught by Professor Vallis during the Spring '11 term at Dalhousie.

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