A tuning capacitor in a 20 kHz radio receiver experiences a peak current of 55 mA with an rms voltage of 7.0 V. Determine the capacitance (C) of this tuning capacitor.

• A. 5.1 × 10^-7 F
• B. 6.3 × 10^-8 F
• C. 3.1 × 10^-8 F
• D. 4.4 × 10^-7 F

Answer: (D)