LR Circuits: A 45-mH inductor is connected in series with a 60-? resistor through an ideal 15-V dc power supply and an open switch. What is the current 7.0 ms after closing the switch?
A. 250 mA
B. 650 mA
C. 550 mA
D. 280 mA
E. 850 mA
Answer: A
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Beats: Two pure tones are sounded together and a particular beat frequency is heard. What happens to the beat frequency if the frequency of one of the tones is increased?
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A particle (mass = 4.0 g, charge = 80 mC) moves in a region of space where the electric field is uniform and is given by Ex = ?2.5 N/C, Ey = Ez = 0 . If the velocity of the particle at t = 0 is given by vx = 80 m/s, vy = vz = 0, what is the speed of the particle at t = 2.0 s?
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