circulution Shielded Protons Magnetic field strength must be increased for a shielded proton to flip at the same frequency. electrons shielding effective effective field field 70.458 70.459 300 MHz 300MH2 300MH2 absorbs does not absorbs absorb 9 70,459 gauss 70.459 gauss 70,460 gauss naked proton shielded proton stronger applied field absorbs at 70.459 G feels less than 70,459 G compensates for shielding Copyright 2005 Pearson Prentice Hall,Inc. Chapter 13 8 Shielded Protons Magnetic field strength must be increased for a shielded proton to flip at the same frequency. =>