(Solved): A charged particle (m=5.0g,q=70mC moves horizontally at a constant speed of 30km/s in a regi ...

A charged particle $(\mathrm{m}=5.0\mathrm{g},q=?70\mathrm{mC}$ moves horizontally at a constant speed of $30\mathrm{km}/\mathrm{s}$ in a region where the free fall gravitationsl accelen ation is $9.8\mathrm{m}/{\mathrm{s}}^2$ downward, the electric field is $700\mathrm{N}/\mathrm{C}$ upward, and the mametic field is perpendicular to the velocity of the particle. What is the magentuste of the magnetic fleld in this region? Witsh his