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

1#

09.36: For the RC cirp u x7 spnbk7i36)fn;zcuit 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 initially uncharged when the switch S is closed at time t=0. At somn63n;7bx) fskzpup7ietime 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 p2:0xmg lqwz(h;e,dz;of1e ime to charge the capacitor(s) to 90% of the full charge? All batteries are ideal and identical with EMF ξ , all resistors are ide; flhz1(; zpxe 0:iomqg2,edwntical 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 ved f3 -l)ey.m*pxc4is- zymzg/ ry longtime. All circuits elements are considerdci. -sm-px/ *)3fyym4e g lzzed 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 i4gwsgs( 5 p4igs 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 voltage across the capacitor three times a5spg(w gg4i 4ss large as the voltage across the resistor?

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