1. if there is no net force on the electron, relate magnetic field to electric field. 2. write down equations for the force of an electron owing to a magnetic field and the force on an electron owing to an electric field. 3. By relating the current to the drift velocity and the electric field to a hall voltage, write down a formula for the Hall voltage in terms of I, B,( the carrier concentration), e( the electronic charge), and t (the sample thickness) 4. In a copper sample for instance, a Hall voltage of 0.74 u is measured for B =1 T and I = 10 A, whilst in a si sample, a hall voltage of 30m V is measured at B= 0.5 T and I = 1UA. Calculate the carrier concentration in both assuming the sample thickness is 1mm in both cases.