An aeroplane is moving towards north horizontally with a speed of 200 m $s^{-1}$ at a place where the vertical component of earth’s magnetic field is 0.5 x ${10}^{-4}$tesla. Then the induced e.m.f. set up between the tips of the wings of the plane if they are 10 m apart is

• A

   0.1 volt

• B

  0.01 volt

• C

  10 volt

• D

  1 volt