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 cap q 159obme8nstacito)rq v6 s ;ac *hr-eufqh-zo;c4r is connected to a battery in a circuit. The capacitor is fully charged before the battery is d r zv )s-4cchq-f 6;auoheq*r;isconnected from the circuit. A uniform material of dielectric 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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