$A$ particle of charge $16 \times 10^{-16} \, C$ moving with velocity $10 \, ms^{-1}$ along the $x$-axis enters a region where a magnetic field of induction $\vec{B}$ is along the $y$-axis and an electric field of magnitude $10^4 \, Vm^{-1}$ is along the negative $z$-axis. If the charged particle continues moving along the $x$-axis,the magnitude of $\vec{B}$ is:

• A
  $16 \times 10^3 \, Wb \, m^{-2}$
• B
  $2 \times 10^3 \, Wb \, m^{-2}$
• C
  $1 \times 10^3 \, Wb \, m^{-2}$
• D
  $4 \times 10^3 \, Wb \, m^{-2}$