The magnetic field of a plane electromagneticwave is given by :

$\overrightarrow{B}={\overrightarrow{B}}_0\hat{i}[\cos (kz-\omega t)+B_1\hat{j}\cos (kz+\omega t)$

where $B_0=3\times 10^{-5}$T and B $B_1=2\times 10^{-6}$T

The rms value of the force experienced by astationary charge Q = $10^{-4}$ C at z =0 is closest to: