If we compress the entire history of the universe into one year, the Earth formed
A) in early February
B) in early September
C) in late December
D) in late September
B
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Solenoid: An ideal solenoid with 400 turns has a radius of 0.040 m and is 40 cm long. If this solenoid carries a current of 12 A, what is the magnitude of the magnetic field at the center of the solenoid? (?0 = 4? × 10-7 T ? m/A)
A. 16 mT B. 4.9 mT C. 15 mT D. 6.0 mT E. 9.0 mT
An acoustical engineer in designing a music hall is concerned with
A) echoes. B) reflection. C) reverberations. D) all of the above E) none of the above
Series Resonance: A series RLC circuit has a 100-? resistor, a 0.100-?F capacitor and a 2.00-mH inductor connected across a 120-V rms ac voltage source operating at 1000/? Hz. What is the resonant frequency of this circuit?
A. 70.7 kHz B. 17.9 kHz C. 22.5 kHz D. 35.3 kHz E. 11.3 kHz
A resistor and an ideal inductor are connected in series to an ideal battery having a constant terminal voltage V0. At the moment contact is made with the battery,
(a) the voltage across the resistor is A) V0. B) V0/e. C) V0/2. D) zero. (b) the voltage across the inductor is A) V0. B) V0/e. C) V0/2. D) zero. What will be an ideal response?