Charging and Discharging of capacitor

1#

09.36: For the RC circuit shown, the resistance is R = 0.1d2 u:19xl8l n fh(ciwf-woe x60 R, the capacitance is C =5.0 F and the battery has voltage ξ=12 V. The capacitor is initially uncharged when the switcew61 2fxl8fonh x9 (wcdiu- l:h 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, wv*nfgq-u p nq;evd:mob .i.77hich will take the least time to charge the capacitor(s) to 90% of the full charge? All batteri f*m7eqv iung.:-7nd.opbq;ves 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 switch S has bem9 zgeqb9 lva;k +n;e9en left open for a very longtime. All circuits elements are considered to be ideal. Which one of the foll99q;bee9+n ;vzmak glowing 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 circu g5/f3rnodjlvmf p+pi of7f4).fm3(iit 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 the voln5 i(g/ rvmp+dilo3fp.j7fo )fm34 fftage across the capacitor three times as large as the voltage across the resistor?

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