32.  The velocity of an electron at a point A is ${10}^7$ ms^-1 .  Find : (i)  direction and magnitude of the magnetic field due to which the electron will go from A to B on the semi-circular path shown,  (ii)  time taken by the electron in going from A to B.
                                                  [Answer: (i)  $1.12\times {10}^{-3}T$ , perpendicular to the plane of paper pointing downwards, (ii)  $1.57\times {10}^{-8}s.$]