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    14.素養(4)
1 如圖所示,當開關在 t=0 秒打開瞬間,電感器上的電壓 VL 值為
A 50V
B -50V
C 100V
D -100V

充電完成,電感短路,電容開路

IL = 75/(5+10) = 5A

VC = 10Ω兩端電壓 = 75 × 1010+5 = 50V

VL = VC - V10Ω - V20Ω = 50 - 10×5 - 20×5 = -100V