A transformer is a device used to
A)
transform an alternating current into a direct current.
B)
transform a direct current into an alternating current.
C)
increase or decrease an ac voltage.
D)
increase or decrease a dc voltage.
C
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If two straight lines start out parallel but eventually cross, then they must be in a
A) flat geometry. B) saddle-shaped geometry. C) spherical geometry. D) spacetime geometry.
A +5.0-µC point charge is 12 cm from a -5.0-µC point charge. What is the magnitude of the field they produce at the point on the line connecting them where their electric potential (relative to infinity) is zero?
(k = 1/4??0 = 9.0 × 109 N ? m2/C2 ) A) 0 N/C B) 12.5 MN/C C) 0.75 MN/C D) 25 MN/C E) 1.5 MN/C
What is the Pauli exclusion principle?
a. Only two electrons can be in the same state (have the same quantum numbers). b. No two electrons can be in the same state (have the same quantum numbers). c. Electrons repel each other. d. No two elements can have electrons in the same state (with the same quantum numbers). e. No two electrons can occupy the same shell.
A 2.00 kg mass is located at (4.00 m, 0.00 m, 0.00 m) and a 4.00 kg mass is located at (0.00 m, 3.00 m,0.00 m). If this system of masses rotated about the Z-axis perpendicular to the X-Y plane, then the moment of inertia of this system is
A. 50 kg 
B. 55 kg
C. 58 kg
D. 62 kg
E. 68 kg