A charge of 4.0 μ C is moving with a velocity of 4.0 × 10^6 ms^-1 along the positive y axis under a magnetic field B of strength (2 k ) T. The force…

A charge of $\displaystyle 4.0 \mu \mathrm{C}$ is moving with a velocity of $\displaystyle 4.0 \times 10^6 \mathrm{~ms}^{-1}$ along the positive $\displaystyle y$ axis under a magnetic field $\displaystyle \vec{B}$ of strength $\displaystyle (2 \hat{k}) \mathrm{T}$. The force acting on the charge is $\displaystyle x \hat{i} N$. The value of $\displaystyle x$ is $\displaystyle \_\_\_\_$.