Question

For an isotropic medium $B,\mu ,H$ and $M$ are related as (where $B,{\mu }_0,H$ and $M$ have their usual meaning in the context of magnetic material :

• A. $(B-M)={\mu }_{0}H$
• B. $M={\mu }_0(H+M)$
• C. $H={\mu }_0(H+M)$
• D. $B={\mu }_0(H+M)$

Answer 1

Answer: (D)

When a magnetic material is placed in a magnetic field, the magnetic material gets more magnetised.
Hence, the net magnetic field is given by,
$B=B_0+B_m={\mu }_{0}H+{\mu }_{0}M$
$={\mu }_0(H+M)$