distance apart, and each initialiy to the other. With time, charge force MCAT Ph
ID: 1787451 • Letter: D
Question
distance apart, and each initialiy to the other. With time, charge force MCAT Physics Practice Questions 44. Two identical small charged spheres are a certain experiences an electrostatic force of magnitude F due gradually diminishes on both spheres. What is the magnitude of the electrostatic when each of the spheres has lost half its initial charge? D. 2 F C. 1/4 F B. 1/8 F 45. 4S,. A proton, moving in a uniform magnetic field., moves in a circle perpendicular to the field lines and takes time T for each cirele. If the proton's speed tripled, w be its time to go around each circle? A. T/3 B. T C. 6T D. 3T 46. As measurements of the electrostatic field strength are taken at points that progressively approach a negatively-charged particle, the field vectors will point A. away from the particle and have constant magnitude B. away from the particle and have progressively decreasing magnitude C. towards the particle and have progressively increasing magnitude D. towards the particle and have progressively decreasing magnitudo 47. Every proton in the universe is surrounded by its own: I. electric field II. gravitational field C. Ill only III. magnetic field A. I only B. Il only D. I'll and 111 48. A charge O- 3.1 x 10S C is fixed in space while another charge q10 C is 6 m away. Charge g is slowly moved 4 m in a straight line directly toward the charge . How much work is required to move charge q? (Use Coulomb's constant k = 9 x 10, N·m,C) A.-0.09 J B.-0.03J C. 0.16J D. 0.08 J A point charge --600 nC. What is the number of excess electrons in charge Q? 49. (Use the charge of an electron e -1.6 x 10-19 C) A, 5.6× 1012 electrons B. 2.1 x 101 electrons C. 2.8 x 101 electrons D. 3.8 x 102 electrons 50. In electricity, what quantity is analogous to acceleration of gravity, g (i.e. a force per unit mass)? A. Electric charge B. Electric current C. Electric field D. Electromagnetic force 134 Copyright © 2018 Sterling Test Prep. Any duplication is illegalExplanation / Answer
F = k*q1*q2/r^2
after losing half charge
q1' = q1/2
q2' = q2/2
F' = k*q1'*q2'/r^2
F' = k*q1*q2/(4*r^2) = F/4
OPTION C
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45)
r = mv/(qB)
time period T = 2*pi*r/v = 2*pi*m/(q*B)
T is independent of speed
OPTION B
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46)
towards the particle and progressivelyincreasing magnitude
OPTION ( c )
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47)
every charge has electric field associated with it
IN the universe every particle experiences gravitational field and magentic fiel dbeacuse of other planets
OPTION ( D )
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48)
work = U2 - U1 = k*Q*q/r2 - k*Q*q/r1
Work = - 9*10^9*3.1*10^-5*10^-6/2 + 9*10^9*3.1*10^-5*10^-6/6
work = -0.09 J
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49)
Q = n*e
n = Q/e
n = 600*10^-9/(1.6*10^-19)
n = 3.8*10^12 electrons
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50)
OPTION (c)
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