Select the formula for calculation
Electric field strength
![Electric field](/formulae_view/i/h64_2.png)
Electric field strength
Surface charge density
Absolute dielectric capacitivity
Field strength on sphere's surface
Capacitance
![Electric field](/formulae_view/i/h64_4.png)
Capacitance of plane capacitor
![Electric field](/formulae_view/i/h64_5.png)
Capacitance of spherical capacitor
Capacitance of solitary sphere
![Electric field](/formulae_view/i/h64_7.png)
Parallel connection of capacitors
![Electric field](/formulae_view/i/h64_8.png)
Series connection of capacitors
Interaction force of two point charges
Interaction force of charged plates
Electrical field energy
Energy of plane capacitor
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