Sunday
April 20, 2014

Homework Help: Physics

Posted by Anonymous on Sunday, June 16, 2013 at 4:23am.

(a) In the LC circuit shown in the figure, the current is in the direction shown and the charges on the capacitor have the signs shown. At this time,

a) the current is increasing and the charge on the positive plate is increasing.

b) the current is increasing and the charge on the positive plate is decreasing.

c) the current is decreasing and the charge on the positive plate is increasing.

d) the current is decreasing and the charge on the positive plate is decreasing.

e) the current and the charge on the positive plate are constant in time.

f) none of the above

For the following questions, assume that the inductance is 0.05 H, the capacitance is 4 [mathjaxinline]\mu[/mathjaxinline]F, and the maximum magnitude of the current in the circuit is 90 milliAmps.

(b) How many times per second will the magnitude of the current have this maximum value?

(c) The energy stored in the capacitor oscillates up and down as a function of time. What is the magnitude of the difference (in Joules) between the largest and smallest amounts of energy ever stored in the capacitor?

(d) What is the time averaged power (in Watts) flowing into or out of the self inductor over 3 full cycles? Define power into the inductor as positive.

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