Physics - Magnetism Question with Solution | TestHub

Key Idea: When a charge q moves with velocity $\vec{v}$ inside magnetic field of strength $\overrightarrow{\mathrm{B}}$, then force on charge is called magnetic Lorentz force. The magnetic Lorentz force is in the direction of vector $\overrightarrow{\mathrm{v}}\times \overrightarrow{\mathrm{B}}$ $$\begin{array}{rl}& \text{ Magnetic Lorentz force }\overrightarrow{\mathrm{F}}=q(\overrightarrow{\mathrm{v}}\times \overrightarrow{\mathrm{B}})\\ & =-2\times 10^{-6}\left[2\times 2\times 10^6\right]\\ & =8\mathrm{N}\text{ along negative -axis }\end{array}$$