Electric and Magnetic Forces on Electrons

An electromagnetic wave travelling in x-direction is described by field equation $E_y = 300\, \sin\, \omega\left(t - \dfrac{x}{c}\right)$. If the electron is restricted to move in y-direction only with speed of $1.5 \times 10^6\, \text{m/s}$ then ratio of maximum electric and magnetic forces acting on the electron is _____.