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please solve and explain! Why is the phase angle between the voltages of the inductor and...

please solve and explain!

  1. Why is the phase angle between the voltages of the inductor and capacitor in a LRC series circuit 180o?
  2. An LRC circuit is at critical damping with R = 100 Ω. Starting from its maximum value, the charge on the capacitor drops to 50% of its value in a time t = 5 ms. What are the values of the inductance L and the capacitance C?
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