Electricity and Circuits: Capacitor - 无忧得胜-网上国际课程 (5edu.win)

1#

09.36: For the RC circuit sh9 laqwm/q2ed whv fj1qnz6e :h*44j+ mown, 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 when 2 q:1+a6dl4em mwqjf qj/nw z*9hhve4the 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 charge qwuzz s kydr*yn0ut j9; 8;e**:qbt k9the capacitor(s) to 90% of the full charge? All batteries are ideal and identical with EMF ξ , all resistors are identical with resistance R , and all capacitors are identuzdruy 8 90: *;wt;9kteqk* n*byqzjsical 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 shownbrf+(a)jcj ,t29 e 4aflg:bqd,the switch S has been left open for a very longtime. All circuits elements are considered ge,)4cf+b q:(jj9f2lb d aartto be ideal. Which one of the following statements best describes the behavior of the current through 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 tp /n 0nqtq2 lpjjqx48m:+ ds.dm/,i nlhe RC circuit 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 capacitor is initially uncharged. How long after the switch is closed is t: sn . mmp x/d,jqpl+4ndql 0j2n8iq/the voltage across the capacitor three times as large as the voltage across the resistor?

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