2150 mA E) 1.19 mA 16) In an LC circuit with an inductance of 40 mH and capacita

Question

2150 mA E) 1.19 mA 16) In an LC circuit with an inductance of 40 mH and capacitance of 1.2 mF, the maximum charge on 16) the capacitor is 45 mC during the oscillations which occur. What is the maximum current through the inductor during the oscillations? A) 42 A B) 2.5 A C) 6.5 A D) 3.7 A E) 10 A 17) What is the inductive reactance of a 20-mH inductor at a frequency of 60 Hz? 17) A)7.5 ? B) 7.5 m.2 C) 0.13 ? D) 1.2 m E) 1.2? 18) When a 60-Hz voltage is applied to a 22-HF capacitor, the capacitive reactance is 18) A) 510 Q. C)121 ?.

Explanation / Answer

16) maximum energy of oscillation = L I^2 / 2 = Q^2 / 2 C

(40 x 10^-3) (I^2) = (45 x 10^-3)^2 / (1.2 x 10^-3)

I = 6.5 A  

Ans(C)

17) XL = 2 pi f L = 2 x pi x 60 x 0.020

XL = 7.5 Ohm Ans(A)

18) Xc = 1/(2 pi f C)

Xc = 1 / (2 x pi x 60 x 22 x 10^-6) = 121 Ohm

Ans(C)

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