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

1#

09.36: For the RC circi )mzt(p,j bp, q6f)pz/0lwf luit shown, 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 impzfpbil j,qtp/w (z ,6fl))0 nitially uncharged when 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 th2,j1+y: vpy9hv0 k4 n iocs;ryph gdu:e least time to charge the capacitor(s) to 90% of the full charge? All bas04rph+92k j:vyg;o1d c :nyi v,uphytteries are ideal 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 shown,the s1qfbp7d55e7svzw9o . -ujcrrdy( k5 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 tp-.5jsde 1o9r 7bu rksfqzwvd5c57y(he 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 closn7icc d- (8mawb.z(bw ed 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 the voltage across the capacitor three times as large as the voltage ac8b. m(wdi w(n c7bz-caross the resistor?

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