Some metal alloy is known to have electrical conductivity and

Some metal alloy is known to have electrical conductivity and electron mobility values of 1.5 x 107 (ohm-m)-1 and 0.0020 m2/V-s, respectively. Through a specimen of this alloy that is 35 mm thick is passed a current of 45 A. What magnetic field would need to be imposed to yield a Hall voltage of -1.0 x 10-7 V?..