✔ 最佳答案
Ok. I understand.
For any capacitors, there is a relationship
Q = CV, where Q is the quantity of charge, C is the capacitance and V is the potential difference.
Since Q = 20uC and V=100V,
C = Q / V = 200nF.
Note the units:
[Q]: Coulombs
[C]: Farad
[V]: Volts
Thank you for reading