本题目来源于试卷: Fields D.2 Electromagnetic Fields & Potential，类别为 IB物理学
[单选题]
Two charges separated by a dza/n5 ats, ls8istance k7ps6zg k*)blx ,k 3zfr are placed in a medium with permittivity ϵ. The charges are then moved to air so that they have the same for6*b)kpzsg k ,l3xzk f7ce between them as that in the medium.
What is the distance between the charges in air, knowing that $ϵ$=$ϵ_r$$ϵ_0$?
A. $ϵ_rr$
B. $\frac{r}{ϵ_r}$
C. $\frac{r}{\sqrt{ϵ_r}}$
D. $r\sqrt{ϵ_r}$
参考答案: D
本题详细解析:
| 
