Question

A parallel-plate capacitor with only air between its plates is charged by connecting the capacitor to a battery. The capacitor is then disconnected from the battery, without any of the charge leaving the plates. (a) A voltmeter reads 45.0 V when placed across the capacitor. When a dielectric is inserted between the plates, completely filling the space, the voltmeter reads 11.5 V. What is the dielectric constant of the material

Answer 1

3.91

Step-by-step explanation:

Given that

Final reading of the voltmeter, V2 = 45 v

Initial reading of the voltmeter, V1 = 11.5 v

The dielectric constant k, of a material is usually given as

k = V2/V1

k = 45 / 11.5

k = 3.91

Therefore, the dielectric constant of the material as we've calculated above is sure to be 3.91.

I hope that helps you understand