試題詳解

20. A 1.0µF capacitor with an initial stored energy of 0.50 J is discharged through a 1.0 MΩ resistor. What is the current through the resistor when the discharge starts?
(A)1.0×10⁻³A 
(B)2.0×10⁻³A  
(C)1.0×10⁻²A  
(D)2.0×10⁻²A  
(E)5.0×10⁻²A