A copper strip electrons per cubic centimeter) 14.8 cm wide and 0.14 cm thick is used to measure the magnitudes of unknown magnetic fields that are perpendicular to the strip. The charge on the electron is
1.6\times 10^(-19)C
. Find the magnitude of
B
when the current is 20 A and the Hall voltage is
1.2\mu V
. Answer in units of T. Answer in units of T .