What is the sensitivity when the input voltage is 100uv and the pen deflection is 10mm?

To determine sensitivity in this context, one must understand that sensitivity refers to how many microvolts of input result in a specific amount of pen deflection on the EEG recording. In this case, the input voltage is 100 microvolts (uV) and the pen deflection is 10 millimeters (mm).

The formula for sensitivity is calculated by dividing the input voltage by the pen deflection:

Sensitivity = Input Voltage / Pen Deflection.

Substituting the given values:

Sensitivity = 100 uV / 10 mm = 10 uV/mm.

This means that for every millimeter of deflection on the EEG tracing, there is an equivalent input of 10 microvolts, indicating that the system is set to record a sensitivity of 10 uV/mm. This value effectively represents how responsive the EEG device is to electrical signals.

Thus, the correct response to the question about sensitivity is indeed 10 uV/mm. The other choices reflect different calculations or misunderstandings of the relationship between voltage and deflection, which do not correspond to the values provided in the question.