本题目来源于试卷: Dielectric Material，类别为 美国物理杯赛(Physics Bowl)
[单选题]
03.44: A circular parallel-plate capacitor is connected to l70m./*vto ut,gzjwret)w ;j7yatn- a battery1gtuom5wq8 * o48oqbhko2bj+cu6+ b r in a circuit. The capacitor is fully charged before the battery is disconnected from the circuit. A uniform material of dielectricco*boq8uh 4+to2ob qgr +j 5m61wbk8u constant $κ$ is inserted between the plates of the capacitor, effectively filling the space between the plates. Let $U_old$ be the energy stored by the capacitor before the dielectric was inserted, while $U_new$ is the energy stored after the dielectric was inserted. The ratio of $U_new/U_old$ is
A. $\frac{1}{K^{2}}$
B. $\frac{1}{K}$
C. 1
D. $k$
E. $K^{2}$
参考答案: B
本题详细解析:
暂无
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