MULTIPLE CHOICE 1.) When an object gets charged by rubbing, where does the elect
ID: 2003365 • Letter: M
Question
MULTIPLE CHOICE
1.) When an object gets charged by rubbing, where does the electric charge originate?
(a) It comes from the air surrounding the object.
(b) It is created by the rubbing energy
(c) The process of rubbing leads to a redistribution of charge, not the creation of charge.
2.) Identically charged objects A and B are separated by a distance d. You measure the force F that A exerts on B. If you now separate the objects by distance 1.4d, what will be the new force that A exerts on B?
(a) 1.4 F
(b) 2.0 F
(c) 1/2 F
(d) 1/1.4 F
(e) F
3.) Balloon A has charge q, and identical mass balloon B has charge 10q. You hange them from threads near each other. Choose all of the statements with which you agree.
(a) The force that A exerts on B is 1/10 the force that B exerts on A.
(b) The force that A exerts on B is 10 times the force that B exerts on A.
(c) A and B exert the same magnitude forces on each other.
(d) The angel between the thread supporting A and the vertical is less than the angle between the thread supporting B and the vertical.
4.) Two objects with charges +q and -2q are separated by a distance r. You slowly move one of the objects closer to the other so that the distance between them decreases by half. Considering the two objects as the system, which statement is incorrect?
(a) The electric potential energy of the system doubles.
(b) The electric potential energy of the system decreases by half.
(c) The magnitude of the electric potential energy doubles.
(d) The magnitude of the electric potential energy decreases by half.
5.) Two small objects, each with charge + 5.0x10^-9 C, are separated by a distance of 50 cm. What is the magnitude and the direction of the electric force that they exert on an identical third object that is 50 cm form each of them?
(a) 1.6x10^-6 N, perpendicular to the line connecting the charges.
(b) 1.6x10^-6 N, parallel to the line connecting the charges
(c) 1.8x10^-6 N, perpendicular to the line connecting the charges.
(d) 1.8x10^-6 N, parallel to the line connecting the charges.
Explanation / Answer
1. (c) The process of rubbing leads to a redistribution of charge, not the creation of charge.
2. (c) 1/2 F
as F = kq1q2/r2 = 1/1.42 = 0.510 F
3. (c) A and B exert the same magnitude forces on each other.
4. (b) The electric potential energy of the system decreases by half.
5. (c) 1.8x10^-6 N, perpendicular to the line connecting the charges.
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