Electricity & Magnetism

Capacitor with Dielectric

C=κε0AdC = \kappa\varepsilon_0\frac{A}{d}

Capacitance of parallel plate capacitor with dielectric material.

Variables

C
Capacitance
Capacitance with dielectric
In SI units: A²·s⁴/(kg·m²)
Allowed values: greater than 0
F
κ
Dielectric constant
Relative permittivity
Allowed values: 1 or more
unitless
ε₀
Permittivity
8.85×10⁻¹²
In SI units: A²·s⁴/(kg·m³)
Allowed values: greater than 0
F/m
A
Plate area
Area of each plate
Allowed values: greater than 0
m²
d
Separation
Distance between plates
Allowed values: greater than 0
m

Derivation

Dielectric increases capacitance by factor κ. C = κC₀ = κε₀A/d.

Your notes

0/5000

Constants in this formula

ε₀
8.854 × 10⁻¹². Measured (CODATA 2018).
F/m

Check value

Round inputs run through this page's calculator, with each constant at its tabulated value. Use it to test your own working or a rearranged form. It is a test case, not a real-world example.

  • κ = 1.5 (Dielectric constant)
  • ε₀ = 8.854 × 10⁻¹² F/m (Permittivity)
  • A = 3 m² (Plate area)
  • d = 4 m (Separation)

Result: C = 9.96075 × 10⁻¹² F

Other electricity & magnetism formulas with the same quantities

Where this formula is listed

Common questions

What is the Capacitor with Dielectric formula?

Capacitor with Dielectric is written C = κε₀(A/d). Capacitance of parallel plate capacitor with dielectric material. It belongs to Electricity & Magnetism, under Capacitance.

What are the units in C = κε₀(A/d)?

In SI units, C is capacitance, measured in A²·s⁴/(kg·m²); κ is dielectric constant (dimensionless); ε₀ is permittivity, measured in A²·s⁴/(kg·m³); A is plate area, measured in m²; d is separation, measured in m.

How is the Capacitor with Dielectric formula derived?

Dielectric increases capacitance by factor κ. C = κC₀ = κε₀A/d. The result is C = κε₀(A/d).