Posted by linds on Wednesday, March 21, 2012 at 1:51am.
1. A 26.0Ω resistor, a 12.0µF capacitor, and a 17.0mH inductor are connected in series with a 150V generator.
(a) At what frequency is the current a maximum?
2.A series circuit contains only a resistor and an inductor. The voltage V of the generator is fixed. If R = 20 Ω and L = 2.8 mH, find the frequency at which the current is onefifth its value at zero frequency?

physics please help!!  drwls, Wednesday, March 21, 2012 at 2:01am
1) Maximum current occurs at resonant frequency
f = sqrt(LC)/(2 pi)
2) Compute the angular frequency w for which the impedance magnitude is increased by a factor of 5.
I = (1/5)(V/R) = V/Z
= V/sqrt[R^2 + (wL^2])
V cancels out; solve for w.
Then use
f = 2 pi w

physics please help!!  linds, Wednesday, March 21, 2012 at 2:05am
Can you plug in the numbers for #1 please? I'm still a little confused.

physics please help!!  drwls, Wednesday, March 21, 2012 at 6:00am
Sorry about that. The LC term should have been in the denominator, for problem #1.
Answer This Question
Related Questions
 physics so confused  1. A 26.0Ω resistor, a 12.0µF capacitor, and a 17.0...
 physics  An inductor (L=440mH), a capacitor (C=6.00μF), and a resistor (R=...
 physics  A series circuit contains only a resistor and an inductor. The voltage...
 Physics  A series circuit contains only a resistor and an inductor. The voltage...
 Physics  In a series circuit, a generator (1400 Hz, 12.0 V) is connected to a ...
 Physics  In a series circuit, a generator (1400 Hz, 12.0 V) is connected to a ...
 physics  In a series circuit, a generator (1254 Hz, 13.8 V) is connected to a ...
 Physics  When a resistor is connected across the terminals of an ac generator (...
 Physics  When a resistor is connected across the terminals of an ac generator (...
 Physics  A series circuit contains only a resistor and an inductor. The voltage...
More Related Questions