The shielding in NMR is: a.) Place a metal around the sample tube before placing it in the instrument b.) use a metal block to avoid being attacked by an opponent c.) Block the view of a participant in a concert d.) When the magnetic moment of an atom blocks the induced magnetic moment of neighboring nucle
Nuclear magnetic Resonance is a physical phenomenon when nuclei are disrupted by a faint oscillating magnetic field in a strong constant magnetic field and react by generating an electromagnetic signal at a magnetic field frequency characteristic in a nucleus.
Shielding is a barrier created by electrons in inner shells that eliminates the pull of the nucleus on external electrons. . The smaller the electron density around the proton, the bigger is the induced secondary magnetic field which opposing the resultant magnetic momentum . Also higher the electron densities around the nucleus, higher will be the magnetic field oppose the electron, so the shielding will be greater . Hence it needs a lower frequency to achieved .If the electron density around the nucleus decreases the opposing magnetic field become small .
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