d
$(A)$ Graph between Magnetic susceptibility and magnetising field is:
(Image)
$(B)$ magnetic field due to a current carrying wire for $\mathrm{x}<\mathrm{a}$ :
$\mathrm{B}=\frac{\mu_0 \mathrm{ir}}{2 \pi \mathrm{a}^2}$
(Image)
$(C)$ magnetic field due to a current carrying wire for $x>a$ :
$B=\frac{\mu_0 i}{2 \pi a}$
(Image)
$(D)$ magnetic field inside solenoid varies as:
