1) You are designing an apparatus to monitor the breathing of a patient. The app
ID: 1259499 • Letter: 1
Question
1) You are designing an apparatus to monitor the breathing of a patient. The apparatus consists of a stretchable loop of conductive material wrapped in a small band around the patient's chest. A constant uniform external magnetic field is produced by a nearby solenoid. As the patient inhales, his chest expands, stretching the chest band. The resulting increase in the area of the loop causes an emf to be induced in the loop. By measuring the induced emf, you can estimate the patient's breathing rate. You want your apparatus to be able to detect a change in area as small as 3.50 cm2 occuring over a time period of 1.50 s. If the minimum emf that can be reliably detected is 2.00
Explanation / Answer
1)
Here , as EMF induced = Change in FLux / time
2*10^-4 = B*(3.5 *10^-4)/1.5
B = 0.38 T
the external magnetic field is 0.38 T
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