Question: What is the dielectric constant of a material if a capacitor with air as dielectric has a capacitance of 10 µF and the same capacitor with the material has a capacitance of 30 µF?

Options:

1. 1
2. 2
3. 3
4. 4

Correct Answer: 3

Solution:

Dielectric constant ε_r = C_material / C_air = 30 µF / 10 µF = 3.