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標題:

capacitor reactance(電路)

發問:

A circuit consists of an inductor L in series with a capacitor C. Choose from the key the frequency nearest to that at which the magnitude of a 1000 μF capacitor reactance is equal to the magnitude of a 20 mH inductor reactance. A) 1.4 kHz D) 220 Hz G) 22 kHz B) 447 Hz E) 140 Hz C) 355 Hz F) 35.5 Hz

最佳解答:

Let w be the angular frequency at which the reactances are equal Hence, wL = 1/wC where L and C are the inductance and capacitance respectively i.e. w^2 = 1/LC = 1/[(20x10^-3).(1000x10^-6) s^-2 w = 223.6 s^-1 Hence, frequency = 223.6/(2.pi) Hz = 35.5 Hz The answer is option F

其他解答:C8D74AB62542840B