?para-anti-ferro-dia-super

Q.All substances enhances  the effective magnetic field B_eff except

a.paramagnetic

b.antiferromagnetic

c.ferromagnetic

d.superparamagnetic

e.diamagnetic

ANS.---e

Any material, when placed into a constant magnetic field, responds by generating its own magnetic field. The magnetic susceptibility of a substance (or tissue) describes this magnetic response. Diamagnetic materials respond to an applied field with a very weak induced field (approximately10^-6 × the magnitude of the applied field) and in a vector direction that opposes that of the applied field. Paramagnetic materials have a larger induced field (approximately10^-2 to 10^-4 × the magnitude of the applied field), which is in the same vector direction as the applied field. Superparamagnetic and ferromagnetic materials generate a very large induced field, equal to or even greater than the applied field, and, as with paramagnetic substances, the induced field is in the same vector direction as the applied field.

Diamanetic substance reduces  the effective magnetic field B_eff.