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

1#

09.36: For the RC circuit shown, the resistance is R = 0.10 R,;z 6j6k*5z ey(r4y lo-pln gep the capacitance is C =5.0 F and the battery has voltage ξ=12 V. The capacitor is initially uncharged when the switch 4n; zpre6gek5*y(l 6ojz pyl-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 ti 23c+7uxjg r:xlr+gt2ny0qwzme to charge the capacitor(s) to 90% of the full charge? All batteries are id rczn0 + 7gj w+x2uy3rg2lxq:teal and identical with EMF ξ , all 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 , z70c:rshstwfe 1w qgt d./q:ls /+kzshown,the switch S has been left open for a very longtime. All circuits elements are considered to beleq1z:w. /td/ssksch,w7 r ftz:gq+0 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 t(bv6k k0pv- vrime 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 i(0vvkk v -rbp6s the voltage across the capacitor three times as large as the voltage across the resistor?

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