A charged particle is projected in a magnetic field $\vec{B}=(3\vec{i}+4\vec{j})\times 10^{-2}T$ and the acceleration is found to be $\vec{a}=(x\vec{i}+2\vec{j})m/s^2$. The value of x is :

Let $\vec{E}$ and $\vec{B}$ denote electric and magnetic fields in a frame S and ${\vec{E}}^{\prime }$ and ${\vec{B}}^{\prime }$ in another frame S' moving with respect to S at a velocity $\vec{v}$. Two of the following equations are wrong. Identify them: