The field radiated by an infinitesimal dipole of very small length (l S h/50, and of uniform current distribution Io, is given by (4-26a) or klal jkr ao E sin0 ao.Un Determine the (a) ctor effective length (b) maximum value of the vector effective length. Specify the angle. more books at blog. jannatun.com PROBLEMS 127 (c) ratio of the maximum effective length to the physical length l.