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Posted by on Friday, May 10, 2013 at 2:37pm.

Capacitor A and capacitor B both have the same voltage across their plates. However, the energy of capacitor A can melt m kilograms of ice at 0 °C, while the energy of capacitor B can boil away the same amount of water at 100 °C. The capacitance of capacitor A is 8.4 μF. What is the capacitance of capacitor B?

Please note that for water, the latent heat of fusion is Lf = 33.5 x 104 J/kg, and the latent heat of vaporization is Lv = 22.6 x 105 J/kg

  • Physics: Capacitance of Capacitor - , Friday, May 10, 2013 at 3:09pm

    What is your question about this problem?

  • Physics: Capacitance of Capacitor - , Friday, May 10, 2013 at 3:15pm

    What is the Capacitance of capicitor b?

  • Physics: Capacitance of Capacitor - , Friday, May 10, 2013 at 4:40pm

    Q₁=Lf•m = C₁V²/2
    Q₂=Lv•m = C₂V²/2
    Lf•m/ Lv•m=2C₁V²/2 C₂V²
    C₂=Lv•C₁/Lf = 22.6•10⁵•8/33.5•10⁴= 53.97 μF

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