Question

Which unit and approximate value are given for the dielectric strength of air?

Options

• \[\mathrm{F/m}\]; air is approximately \[8.85\times10^{-12}\,\mathrm{F/m}\]

• \[\mathrm{N/C^2}\]; air is approximately \[3\times10^{-6}\,\mathrm{N/C^2}\]

• \[\mathrm{V/m}\]; air is approximately \[3\times10^6\,\mathrm{V/m}\]

• \[\mathrm{C/m^2}\]; air is approximately \[3\times10^6\,\mathrm{C/m^2}\]

Answer 1

Dielectric strength is measured in volts per metre. The approximate value for air is \[3\times10^6\,\mathrm{V/m}\].