Blood Drug Testing

I am a nurse and I need some help with some chemistry.?

I am a nurse from Zimbabwe and am getting ready to take the CGFNS test in order to get my nursing license in Amerika. On the test prevue, I am being asked this strenge kwestion about the magnetic fields that blood produces as it coagulates. The question is: calculate the intensty of the magnetic field in milliteslas that 50 grams of blood produces if it coagulates at an even rate for a duration of 10 minutes before it hardens.

Public Comments

1. OK, an assumption has to be made here. As long as there is no moving charge in the coagulating blood then there is no magnetic field produced and hence the magnitude in Tesla's will be zero. From Physics it is established that a magnetic field is only produced from a moving charge or a permanent magnetic dipole neither of which should be in the blood, Loosely speaking the iron in the blood could under the influence of a strong magnetic field have become aligned but it seems very unlikely that it would maintain the dipole alignment very long and certainly not long enough to be considered in this context.
2. Zero. What a stupid question though to ask on a nursing licence test!