Question

estimate the hall voltages generated in each case across a 5mm width of sample of thickness 1mm when a current 100mA is passed along it and the perpendicular field is given as 100mT

Answer 1

Suppose the sample is made of copper

$V=IB/(nde)=0.1\cdot0.1/(8.4\cdot10^{28}\cdot0.001\cdot1.6\cdot10^{-19})=$

$=7.4\cdot10^{-10}\ (V)$