Charging and Discharging of capacitor

1#

09.36: For the RC circuit 8gbqdgge1 oaf r l16z0 5s+3xtshown, the resistance is R = 0.10 R, the capacitance is C =5.0 F and the battery has voltage ξ=12 V. The capacitor is initially uncharged 5t1g8ox l+sf6bqa31z 0rgeg dwhen the switch S is closed at time t=0. At sometime later, the current in the circuit is 0.50 A. What is the magnitude of the voltage across the capacitor at that moment?

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

09.41: For the circuits shown below, which will take the least time to t4xm:b+rf yfj41 dvp7charge the capacitor(s) to 90% of the full charge? All batteries are ideal and identical with EMF ξ , alt4f7d :pb4v y +j1mxfrl resistors are identical with resistance R , and all capacitors are identical with capacitance C and are initially uncharged.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

14.38: In the circuit n gqg+vw ej86+w7 )vi gij,*rkshown,the switch S has been left open for a very longtime. All circuits elements are considered to be ideal. Which one of the following statements best describes the behavior of the current through )g v+wi,ngq r6ei k7 gj8*jwv+the switch S once it is closed?

A. The current initially is 12 mA and decreases to a steady 3 mA.

B. The current initially is 3 mA and increases to a steady 12 mA.

C. The current initially is 9 mA and decreases to a steady 3 mA.

D. The current initially is 6 mA and decreases to a steady 3 mA.

E. The current is a steady 3 mA.

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

13.45: The switch S in the RC circui).mc7i7 j xwzie y9dg0t shown is closed at time t=0. All circuit elements are ideal and R=10.0Ω, C=2.20 F and ξ = 12.0 V. The ci j7 cgixe)d0 w.7m9yzapacitor is initially uncharged. How long after the switch is closed is the voltage across the capacitor three times as large as the voltage across the resistor?

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