A guitar is perfectly tuned. The tension on its strings is then increased. Which of the following is true?
A. The speed of sounds from the guitar is larger than before
B. The frequencies of sounds from the guitar are higher than before
C. The wavelengths of sounds from the guitar are longer than before
D. The amplitudes of sounds from the guitar are larger
Answer: B
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Particle A has twice as much charge as particle B. Compared to the force on particle A, the force on particle B is
a. ½ as much. b. 2x as much. c. 4x as much. d. The same.
Which of the following best describes the image for a thin concave lens that forms whenever the magnitude of the object distance is less than that of the lens' focal length?
a. inverted, enlarged and real b. upright, enlarged and virtual c. upright, diminished and virtual d. inverted, diminished and real
Potential Energy: In the figure, +4.0-?C and -4.0-?C point charges are located as shown. Now an additional +2.00-µC point charge is placed at point A. What is the electric potential energy of this system of three charges, relative to infinity? (k = 1/4??0 = 8.99 × 109 N ? m2/C2) 
A. +264 mJ B. -264 mJ C. 0.00 J D. -26.4 mJ E. +26.4 mJ
Faraday's Law: A constant uniform magnetic field of 0.50 T is applied at right angles to the plane of a flat rectangular loop of area 3.0 × 10-3 m2. If the area of this loop changes steadily from its original value to a new value of 1.6 × 10-3 m2 in 1.6 s, what is the emf induced in the loop?
A. 1.6 × 10-2 V B. 0 V C. 7.5 × 10-2 V D. 4.4 × 10-4 V E. 9.0 × 10-2 V