An electron entering Thompson's e/m apparatus has an initial velocity( in the horizontal direction only) of (5.00*10^6)m/s. the magnet used in the apparatus has a strength of 15.0mT. (a.) what electrical field will you need in order to produce zero deflection the electrons as they travel through the apparatus? (b) the length of the non-zero electric fields is 1.50cm. when the magnet is removed, but the same electric field remains, how far in the vertical direction will the electron beam be deflected over this length?