At what magnetic of the electric field srength in vacumm the volume energy density of this field is the same as that of the magnetic field with induction `B = 1.0 T` (also in vacumm).

Explanation

`w_(E) = (1)/(2) epsilon_(0) E^(2)`, for the electric field,
`w_(B) = (1)/(2 mu_(0)) B^(2)` for the magnetic field,
Thus, `(1)/(2 mu_(0)) B^(2) = (1)/(2) epsilon_(0) E^(2)`,
when `E = (B)/(sqrt(epsilon_(0) mu_(0))) = 3xx10^(8) V//m`