1.
An electron moving with a velocity V1=2i^m/s\vec{V}_1 = 2\hat{i}\,\text{m/s} at a point in a magnetic field experiences a force F1=2j^N\vec{F}_1 = -2\hat{j}\,\text{N}. If the electron is moving with a velocity V2=2j^m/s\vec{V}_2 = 2\hat{j}\,\text{m/s} at the same point, it experiences a force F2=+2i^N\vec{F}_2 = +2\hat{i}\,\text{N}. The force the electron would experience if it were moving with a velocity V3=2k^m/s\vec{V}_3 = 2\hat{k}\,\text{m/s} at the same point is