Write Fleming's left hand rule. A particle of having charge \( 1.0 \times 10^{-9} \, \text{C} \) enters in a magnetic field of \( \vec{B} = (4 \hat{i} + 3 \hat{j}) \, \text{tesla} \) with velocity \( \vec{v} = (-75 \hat{i} + 100 \hat{j}) \, \text{m/s} \). Find the magnitude and direction of magnetic force exerting on the particle.