## 1 Introduction  
Wireless power transfer (WPT) technology relies on the principle of magnetic resonant coupling between two coils, enabling the efficient transmission of electrical power over distances ranging from several tens of centimeters to a few meters [1; 2; 3; 4; 5]. This technology is increasingly gaining interest as a streamlined method for charging electric vehicles (EVs) without conventional plugs [6]. However, EV charging requires a significant amount of power, reaching several kilowatts, leading to the leakage of strong electromagnetic fields during charging [7]. Concerns about the potential adverse effects for WPT continue to exist, which require further investigation [8]. The International Commission on Non-Ionizing Radiation Protection (ICNIRP) [9; 10; 11] and IEEE International Committee on Electromagnetic Safety Technical Committee 95 [12; 13] have published international guidelines and standards (hereafter referred to as \"guidelines\") limiting exposures to electromagnetic fields for human protection. These guidelines were designed to protect humans from electrostimulation up to 5-10 MHz and heating above 100 kHz. In these guidelines, the operational threshold for adverse health effects is identified [9; 10; 11; 12]. A reduction (safety) factor [11], basic restriction (BR) [9; 10], or dosimetric reference limit [12] (hereafter referred to as BR), which is the electrical quantity related to the health effect, is then derived. For practical assessment, permissible external field strength (hereafter referred to as reference level (RL)) [10] or exposure RL is derived under a worst-case exposure scenario. In the IEEE C95.6-2002 standard [13], the RL, permissible external field strength is derived based on an analytical formula using homogeneous ellipsoidal induction models, which differ between the limb and trunk [13]. International standards for product conformity [14], such as International Electrotechnical Commission (IEC) 61980-1 [15], SAE J2954 [16], and ISO 19363 [17], have been established for WPT in EVs, all of which consider the international exposure guidelines. Computational assessments using human body models have been widely used, including international standardization, because in vivo measurements cannot be performed for the assessment of an induced electric field (e.g., IEC 61980 and SAE J2954). Numerous studies have pointed out the limitation of RL in highly nonuniform environments, such as those emitted from WPT [18; 19; 20; 21]. These results consistently showed that, although the spatial peak magnetic fields at the human body parts exceeded RL, the internal electric fields in the human body were one or two orders of magnitude smaller than the limit of induced physical quantities (see Section 2). The IEC Technical Committee 106 is an international standardization body that provides compliance assessment methods corresponding to international exposure guidelines/standards. The spatially averaged method defined in IEC 62110 was discussed and extended to assess nonuniform fields [22]. The spatial averaging for the magnetic field strength measured (computed) at some points confirms compliance with RL. The assessment of the spatial averaging method is also included in IEC TR 62905 and IEC PAS 63184 [23; 24], wherein various measurement points inside and outside the vehicle are considered. Several studies have evaluated the location of the magnetic field measurement point in realistic vehicle models [25; 26; 27; 28; 29; 30; 31; 32]. As summarized in Section 2, recent studies conducted measurements at designated test points near the vehicle and within the driver's seat. However, the relationship between these measurement points and the internal electric field, which should be assessed computationally, has not been clarified. Appropriate measurement locations that can effectively capture their coupling quantities have not been considered in the current product standards.