Question

If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material are denoted by $\mu d,\mu p\text{and}\mu f$ respectively, then:

• A. $\mu d\ne 0\text{and}\mu f\ne 0$
• B. $\mu p=0\text{and}\mu f\ne 0$
• C. $\mu d=0\text{and}\mu p\ne 0$
• D. $\mu d\ne 0\text{and}\mu p=0$

Answer 1

The correct option is C $\mu d=0\text{and}\mu p\ne 0$

$Solution:$ Magnetic moment of ferromagnetic material

${\mu }_f$ is non-zero always.

Under application of external magnetic field, the paramagnetic material has all the magnetic moments aligned giving off ${\mu }_p\ne 0$.

However the magnetic moments of atoms in diamagnetic material cancels out resulting in ${\mu }_d=0$.

$So,the$ $correct$ $option:C$