<p>Electromagnetohydrodynamic (EMHD) mechanisms play a crucial role in controlling the momentum and energy transport in nanofluid-based systems, offering significant prospects for advanced thermal regulation systems. The current work investigates the coupled influence of externally imposed magnetic and electric fields on nanofluid flow across a rotating conical disk, incorporating Hall current and ion-slip effects to capture finite conductivity phenomena. Two novel scenarios are defined: (i) flow in the absence of an electric field, (ii) flow under an externally imposed electric field. Utilizing similarity transformations, the resulting nonlinear governing equations has been solved numerically using the bvp5c, and a comparative evaluation is done to authenticate the results. The influence of key parameters on velocity profiles (flow), temperature and heat transfer efficiency are illustrated through graphical and tabular results. The findings reveal that the externally applied electric field serves as a primary electromagnetic control mechanism, substantially enhancing the velocity magnitude and temperature distribution. In the absence of electric forcing, the flow exhibits outward radial motion along both the disk and conical surfaces and localized temperature gradients near the disk. The introduction of an electric field alters the flow structure by reversing the radial motion and suppressing axial inflow near the disk, strengthening axial outflow adjacent to the conical surface and redistributing thermal energy more uniformly across the flow domain. These results provide new physical insight into electromagnetic regulation of nanofluid transport and support the modeling and design of electromagnetically controlled systems.</p>