An electron having charge $1.6 \times 10^{-19} \, C$ and mass $9 \times 10^{-31} \, kg$ is moving with $4 \times 10^6 \, m/s$ speed in a magnetic field of $2 \times 10^{-1} \, T$ in a circular orbit. The force acting on the electron and the radius of the circular orbit are:

• A
  $12.8 \times 10^{-13} \, N, 1.1 \times 10^{-4} \, m$
• B
  $1.28 \times 10^{-14} \, N, 1.1 \times 10^{-3} \, m$
• C
  $1.28 \times 10^{-13} \, N, 1.1 \times 10^{-3} \, m$
• D
  $1.28 \times 10^{-13} \, N, 1.1 \times 10^{-4} \, m$