Charging and Discharging of capacitor

1#

09.36: For the RC circuit shown, the resistance is R = 0.10 R, the capacitanc1vs4l5tws a8(h2hjy ke is C =5.0 F and the battery has voltage ξ=12 V. The capacitor is initially uncharged when the switch S is closed at time t=0. At sometime later, the current in the circlt8hkhv 1jswa4 5 y(2suit 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 t(ttfyq2cms-.+(qb -kqhm l f (o charge the capacitor(s) to 90% of the full charge? All batteries are ideal and identical with EMF ξ , all resistors are identical with resistance R , k-.(hq- (q tc 2m( sb+mtflfyqand 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 shown,the switch S has :ygyv- c q1*26alwhfc been left open for a very longtime. All circuits elements2 ahf-1cy:g c6 *wlyqv are considered to 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 the RC circuit shown is closed at tim gon5p57sxw/ r3j xh3ye 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 swi7h33xnyp 5 jr/wxg5sotch is closed is the voltage across the capacitor three times as large as the voltage across the resistor?

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