A Horse and Rider Travel in a Region in Which $0.035 \mathrm{mT}$

A horse and rider travel in a region in which the vertical component of the Earth's magnetic field is $0.035 \mathrm{mT}$ , while the horizontal component is $0.022 \mathrm{mT}$ . Attached to the horse's bridle is a metal bit, a horizontal cylinder approximately $15 \mathrm{~cm}$ long, in the horse's mouth. If the horse is galloping at $15 \mathrm{~m} / \mathrm{s}$ , what is the induced potential difference between the ends of the bit?

A) $50 \mu \mathrm{V}$
B) $93 \mathrm{mV}$
C) $79 \mu \mathrm{V}$
D) $79 \mathrm{mV}$
E) $93 \mu \mathrm{V}$
F) $50 \mathrm{mV}$