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, the l ciwjs )wz1472vg1slcapacitance 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 som swi s wg17cl1zvj2l)4etime 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 timhc+n e.zmf55)z os8ew;hj ei-e to charge the capacitor(s) to 90% of the full charge? All batteries are ideal and identical with EMF ξ , all resistoihe+wz ;f.85snjh) cmez oe5- rs 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 gh vs2fa3.c * rlsu( 7(olem)ph,zb/oa very longtime. All circuits elements are considered to be ideal. Which one of the following statements best describes the be7or /phf( )a,3o eb2scusv hl(mz.lg*havior 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 clos0)ps(r/ xcysc 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 unchargy)s c/spcxr0 (ed. How long after the switch is closed is the voltage across the capacitor three times as large as the voltage across the resistor?

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