电场强度公式（点电荷）
electric field intensity formula (point charge) The magnitude of the electric field intensity produced by a point charge $Q$ at a distance $r$ is $E = k \frac{|
CSCA 物理 考试术语
electric field intensity formula (point charge) The magnitude of the electric field intensity produced by a point charge $Q$ at a distance $r$ is $E = k \frac{|
CSCA 物理 考试术语