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10 Cards in this Set
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A point charge Q is located a short distance from a point charge 3Q, and no other charges are present. If the electrical force on Q is F, what is the electrical force on 3Q? A) F/3 B) F/sqrt(3) C) F D) sqrt(3)F E) 3F |
C) F |
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The figure shows three electric charges labeled Q1, Q2, Q3, and some electric field lines in the region surrounding the charges. What are the signs of the three charges? A) Q1 is Positive, Q2 is negative, Q3 is positive B) Q1 is Negative, Q2 is positive, Q3 is negative C) Q1 is Positive, Q2 is positive, Q3 is negative D) All 3 charges are negative E) All 3 charges are positive |
A) Q1 is Positive, Q2 is negative, Q3 is positive |
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2 point charges Q1 and Q2 of equal magnitudes and opposite signs are positioned as shown in the figure. Which of the arrows best represents the net electric field at point P due to these two charges? A) A B) B C) C D) D E) The field is equal to zero at point P |
A) A |
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A cylindrical wire has a resistance R and resistivity ρ. If is length and diameter are BOTH cut in half. (a) What will be its resistance? A) 4R B) 2R C) R D) R/2 E) R/4 (b) What will be its resistivity? A) 4ρ B) 2ρ C)ρ D)ρ/2 E)ρ/4 |
(a) B: 2R (b) C:ρ |
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When electric current is flowing in a metal, the electrons are moving A) at the speed of light B) at the speed of sound in the metal C) at the speed of sound in air D) at none of the above speeds |
D) at none of the above speeds |
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A restoring the force of magnitude F acts on a system with a displacement of magnitude x. In which of the following cases will the system undergo simple harmonic motion? A) F αsqrt(x) B) F αsinx C) F αx^2 D) F αx E) Fα 1/x |
D) Fα x |
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In a resonating pipe that is open at one end and closed at the other end, there A) are displacement nodes at each end B) are displacement antinodes at each end C) is a displacement node at the open end and a displacement antinode at the closed end D) is a displacement node at the closed end and a displacement antinode at the open end |
D) is a displacement node at the closed end and a displacement antinode at the open end |
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A simple pendulum consists of a point mass suspended by a massless, unstretchable string. If the mass is doubled while the length of the string remains the same, the period of the pendulum... A) becomes 4 times greater B) becomes twice as great C) becomes greater by a factor of ___ D) remains unchanged E) decreased |
D) remains unchanged |
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In a simple harmonic motion, the speed is greatest at that point in the cycle when A) the magnitude of the acceleration is a max B) the displacement is a max C) the magnitude of the acceleration is a min D) the potential energy is a max E) the kinetic energy is a min |
C) the magnitude of the acceleration is a min |
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On a day when there is no wind, you are moving toward a stationary source of sound waves. Compared to what you would hear if you were not moving, the sound that you hear has... A) a higher frequency and a shorter wavelength B) the same frequency and a shorter wavelength C) a higher frequency and the same wavelength D)the same frequency and the same wavelength |
C) a higher frequency and the same wavelength |
