15/07/01 20:26:38.36 .net
>>775
◇Vaの計算
定常状態での電流I=V/(R1+R2)
Va = R2 * I = V*{R2/(R1+R2)} = V*{2R/(R+2R)} = (2/3)V
◇Vbの計算
C1とC2の合成容量C12はC1*C2/(C1+C2)
Q = C12*V = V*{C1*C2/(C1+C2)} = V*{C*2C/(C+2C)} = (2/3)VC
直列のコンデンサにはそれぞれ同量の電荷が蓄えられるので
Q1 = Q2 = Q = V*{C1*C2/(C1+C2)} = (2/3)VC
Vb = Q2/C2 = Q/C2 = (2/3)VC / C2 = (2/3)VC / 2C = (1/3)V