A potential difference of 600 volt is applied across the plates of a parallel plate capacitor, where plates are being separated by 3 mm. An electron projected vertically upward, parallel to the plates, with a velocity of $2\times {10}^6{\mathrm{ms}}^{-1}$ moves undeflected between the plates. The magnitude of the magnetic field in the region between the condenser plates is

• A

  0.1 T

• B

  0.2 T

• C

  $2\times {10}^6\text{\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}T}$

• D

  600 T