3. 如圖二的電路,假設電容器之兩端電壓VC(0) = 0 V,在t ≥ 0其電壓變化為VC(t) = 4(1-e-10t) V的型式,另外R1 = R2 = 4 kΩ,R3 = 8 kΩ,R4 = 3 kΩ,V1 = 8 V,請求出電容C之電容值為多少F?
10/[(8//(4+4)]=25uF