Charging and Discharging of capacitor

1#

09.36: For the RC circuit sh- q b8n98vgxn+wyon:kown, the resistance is R = 0.10 R, the capacitance is C =5.0 F and n qn8k+bwxvngo:- y89 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 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 bwr/a r)e:ta3yc1g o+/a3 i h* p1dfxpielow, which will take the least time to charge the capacitor(s) to 90% of the full charge? All batteries are ideal and identical with EMF ξ ,x r/3rt1pfaoa/aw1cidhe3 )+ y*i: pg 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 been left open for a very ku(ic ncova387 wp 4)ket1(zblongtime. All circuits elements are consider3 ccn vb7p t kk84(ewzu(a)i1oed 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 cloz * ,;am:7lqh*glgem 1ys(cahsed 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 :, g saae*; zq*h(71mlmly hcgthe switch is closed is the voltage across the capacitor three times as large as the voltage across the resistor?

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