A tensor integral equation (EFIE) has been applied to quantify the interaction of ELF-LF EM fields with a human body. The methods of Conjugate Gradient and Guass-Seidel were employed to solve the induced body current iteratively. Numerical results by the EFIE and a scalar integral equation (SCIE) reported recently are compared. The SCIE method was applied to analyze the shock current between a vehicle and a nearby human body when exposed to a 60-Hz high voltage electric field. The equivalent circuit for computing the induced currents of the vehicle and the man was constructed.