What is the capacitance?

What is the capacitance and charge on each electrode?

  • Two 2.2 cm 2.2 cm square aluminum electrodes are spaced 0.40 mm apart. The electrodes are connected to a 100 V battery. (a) What is the capacitance? ___pF (b) What is the magnitude of the charge on each electrode? ___nC

  • Answer:

    Capacitance can be calculated using the formula C = epsilon * A / d (where epsilon is the permittivity of free space 8.854×10^−12 F m^–1) a) C = (8.854 * 10 ^ -12) * (0.022^2) / (0.4 * 10 ^ -3) (converting into SI units) = 1.07 * 10 ^ -11 F = 10.7 pF b) Capacitance is defined as the amount of charged that can be stored per volt. ie C = Q / V 10.7 * 10 ^ -12 = Q / 100 Q = 1.07 * 10 ^ -9 = 1.07 nC I hope I calculated everything right!

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