Question

1. two common inductor cores are

a air and iron
b plastic and teflon
c carbon and copper
d desiccant and lead

Explanation:

Inductors often use air or iron as cores. Air - core inductors have lower inductance and are used in high - frequency applications, while iron - core inductors can have higher inductance due to the high magnetic permeability of iron.

Answer:

A. air and iron