Magnetic field at the center of ring is $\mathbf { 16 ~ } \boldsymbol { \mu T }$. Find magnetic field at axis of ring at distance $\sqrt { 3 } \mathrm { R }$ from center where R is radius of ring
(A) $1 \mu \mathrm {~T}$
(B) $2 \mu \mathrm {~T}$
(C) $4 \mu \mathrm {~T}$
(D) $8 \mu \mathrm {~T}$