This one please asap
Q.5 The magnetic field radially varies as B-Kr",where K and a are positive constants. The current density
as a function of r is given by
(A) u0aKr ^a–1
(B) $\frac{K(a+1)r^{a–1}}{{\mu }_0}$
(C)$\frac{K(a+1)r^{a–1}}{{\mu }_0}$
(D)$\frac{K(a+1)r^{a–1}}{{\mu }_0}$