Discuss the below:
Measurement of physiology
Q: The axial magnetic field at a distance from a magnet falls-off as l/d3 (note: 3 is the power of d, meaning d cube, it's not multiplying with d) where d is the distance to the magnet. A small, strong, permanent magnet generates a magnetic field that is measured by a small probe placed on its axis. It is desired to use the strength of the measured field to find the position of the (slowly moving) probe. What is the minimum number of bits of an analogue to digital converter in order to measure position to a precision of l mm over a distance range from 10cm to 20cm. Give some practical considerations for improving the accuracy of measurement.