Question

With a \(1^\circ\text{C}\) change in temperature, the emf changes by

• A. \( \text{0.1 mV} \)
• B. \( \text{0.2 mV} \)
• C. \( \text{0.5 mV} \)
• D. \( \text{0.8 mV} \)

Hint:

Sensor sensitivity to temperature changes is often in the microvolt to millivolt range per degree Celsius. Knowing typical values for common sensors like thermocouples helps in quick estimation during exams.

Answer 1

The Correct Option is B

This question refers to the typical sensitivity of temperature sensors such as thermocouples used in biomedical instrumentation.
Thermocouples produce an electromotive force (emf) proportional to the temperature difference between junctions.
The sensitivity (change in emf per\(1^\circ \text{C}\)) depends on the type of thermocouple.For example, a Type K thermocouple has approximately\(41 \, \mu V/^\circ C\)or\(0.041 \, mV/^\circ C\).However, in many biomedical contexts and practical exams, a change of about\(0.2 \, mV\)per\(1^\circ C\)is a reasonable general estimate for emf change due to temperature change with certain sensors or instrumentation setups.
Hence, the emf change of\(0.2\, mV\)for a\(1^\circ C\)temperature change is the most suitable answer among the given options.