List of top Atmospheric Science Questions on Electromagnetism

The variance of 20 observations is 5. If each observation is multiplied by 2, then, the new variance of resulting observations is:
A light beam traveling in the x-direction is described by the magnetic field \( B_z = 2 \times 10^{-6} \sin \omega(t - x/c) \) Tesla. The value of the maximum electric field is