An ion source is generating 6Li ions, which encompass mass 9.99 x 10-27 kg and charge +e. The ions are accelerated through a potential difference of 15 kV and pass horizontally to a region in which there is a uniform vertical magnetic field of magnitude B = 2.7 T. Compute the strength of the smallest electric field, to be set up over the similar region, that will permit the 6Li ions to pass through un-deflected.