4. An oscillating LC circuit has a resonant frequency of 1.2 x 10 Hz. The diagra

Question

4. An oscillating LC circuit has a resonant frequency of 1.2 x 10 Hz. The diagram shows the system at 0 s when there is no charge on the capacitor and the current is in the direction shown. At this time, the energy stored in the inductor is 2.5 × 10-7 4a. Determine the numerical value of the capacitance. A) 2.4× 10-11 F B) 3.6× 10-11F C) 4.4 × 10-11 F D) 6.8× 10-11F E) 8.8 × 10-11 F L-0.20 mH 4b. Determine the value of the current at the instant shown in the drawing. A) 0.02 A B) 0.03 A C) 0.05 A D) 0.09 A E) 0.12 A 5. Complete the following statement: The main difference between an npn transistor and a pmp transistor is that A) the bias voltages are reversed. B) they are made from different materials. C) one is a bipolar transistor and the other is not. D) one conducts electricity and the other does not. E) the current directions are the same while the voltages are reversed.

Explanation / Answer

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4

a)

Resonant frequency is given by

fr =1/2psqrt(LC)

=>C=1/4pi2f2L

C=1/4pi2*(1.2*106)2*(0.2*10-3)

C=8.8*10-11 F

b)

E=(1/2)LI2

=>I=sqrt(2E/L)

I=sqrt(2*2.5*10-7/0.2*10-3)

I=0.05 A

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