A paramagnetic sample shows a net magnetisation of `8Am^-1` when placed in an external magnetic field of `0*6T` at a temperature of `4K`. When the same sample is placed in an external magnetic field of `0*2T` at a temperature of `16K`, the magnetisation will be

Options

A. only the orbital motion of the electrons
B. only the spin motion of the electrons
C. orbital and spin motions of the electrons
D. orbital motion of the protons and neutrons

Answer

B

Explanation

Magnetisation or intensity of magnetisation `prop`
`("Magnetic field induciton"("B"))/("Temperature" ("T")` in kelvin)
`therefore (I_(2))/(I_(1)_)=(B_(2))/(B_(1))xx(T_(1))/(T_(2))`
`therefore I_(2)=1/12xx8=2/3 A/m`