Correct

电介质

/ diàn jièzhì / 
Strokes

Example

As a Noun

dielectric (medium)

1
Diàn
电
jièzhì
介质
tiānxiàn
天线

dielectric antenna

2
Diàn
电
jièzhì
介质
qiángdù
强度

dielectric strength

3
Diànjièzhì
电介质
cáiliào
材料

dielectric materials