At a certain altitude above the Earth's surface, the electric field has a magnitude of 135 V/m. How much energy is stored in 1.00 m3 of air due to this field?

Given that,

Electric field E=135V/m

Energy stored in 1m³of air=?

The energy stored in an electric field is given as

u = ½ εo E²

Where

U is the energy stored

εo is permissivity and it value is 8.85*10^-12C²/N ... m²

And E is the electric field

Then,

U=½*8.85*10^-12*135²

U=8.06*10^-8J/m³

Then, the energy stored in 1m³ of air is 8.06*10^-8 J/m³