Helping a confused particle!

A positively charged particle was sitting idle at the origin of a Cartesian coordinate system. The particle is then subjected to an electric field E=E0cos(π2+ωt)ı^\textbf{E}=E_{0}\cos\big(\frac{\pi}{2}+\omega t\big)\hat{\imath} at time t0,t\geq0, where E0E_{0} is a positive constant scalar and ω\omega is the angular frequency of oscillation of electric field in rad/sec.\text{rad}/\sec.

What will the particle do after t=0?t=0?

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