A player with 3 m long iron rod runs towards east with a speed of 30 km/hr. Horizontal component of earth's magnetic field is  $4\times {10}^{-5}\mathrm{Wb}/{\mathrm{m}}^2$. If he is running with rod in horizontal and vertical positions, then the potential difference induced between the two ends of the rod in two cases will be

• A

  Zero in vertical position and $1\times {10}^{-3}\mathrm{V}$ in horizontal position

• B

  $1\times {10}^{-3}\mathrm{V}$ in vertical position and zero is horizontal position

• C

  Zero in both cases

• D

  $1\times {10}^{-3}\mathrm{V}$ in both cases