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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.
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
a. T > 0
b. T = 0
c. T < 0
d. It is impossible to tell from the given
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
a. The density increases linearly with
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.
- Spring '11