Final answer:
To decrease sensation felt under the dispersive pad, one can increase the size of the dispersive pad to reduce current density at a specific point. Decreasing the size of the active pad might help but could also increase current density. Increasing the size of the active pad may also redistribute the current, but effects can vary.
Step-by-step explanation:
To answer the question of what can decrease the sensation felt under the dispersive pad, we should consider the distribution of the electrical current. If there is an uncomfortable sensation present, it is typically because the current density is too high at that specific location. Adjusting the size of the pads can help redistribute the current density and provide relief.
To decrease the sensation felt, you can increase the size of the dispersive pad (c). This helps distribute the current over a larger area, thereby reducing the density of the current at any one point on the skin.
Decreasing the size of the active pad might also help diminish the sensation, but it must be done cautiously as it could potentially increase the current density even further if reduced too significantly.
Lastly, increasing the size of the active pad (a) could potentially create a more even distribution of the electrical current and reduce sensation, but this can vary based on the specific situation and equipment used.