The horizontal component of flux density of earth's magnetic field is $1.7 \times 10^{-5} \mathrm{~T}$. The value of horizontal component of intensity of earth's magnetic field will be
(a) $24.5 \mathrm{Am}^{-1}$
(b) $13.5 \mathrm{Am}^{-1}$
(c) $1.53 \mathrm{Am}^{-1}$
(d) $0.35 \mathrm{Am}^{-1}$