A 120-V rms signal at 60.0 Hz is applied across a 30.0-mH inductor and a 100-? resistor. What is the rms value of the voltage across the inductor?
A) 0.700 V
B) 119 V
C) 100 V
D) 13.5 V
E) 120 V
D
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A camera lens is initially set at f/8 for a shutter speed of 1/250 s. If the amount of lighting on the subject is unchanged, and the lens is set at f/4, what is the proper shutter speed at this setting?
a. 1/1000 s b. 1/500 s c. 1/250 s d. 1/2 s e. 1/8 s
A fully charged parallel-plate capacitor remains connected to a battery while a dielectric is slid between the plates. Does the energy stored in the capacitor increase, decrease, or stay the same?
1.increase 2.decrease 3.remains the same
Atmospheric refraction makes the daylight hours
A) longer. B) shorter. C) neither
the magnetic field increases in magnitude with time.
A. The induced current flows clockwise. B. The induced current flows counterclockwise. C. No current flows in the loop. D. A current flows, but one needs additional information to determine the direction in which it flows. E. One needs additional information to determine even whether a current flows or not.