In a new lab experiment, two parallel vertical metal rods are separated by l = 1.4 m . a r = 2.0-ω resistor is connected from the top of one rod to the top of the other. a m = 0.18-kg horizontal metal bar falls between the rods and makes contact at its ends with the rods. a b→field of 0.50×10−4 t points horizontally between the rods. the bar should eventually reach a terminal falling velocity (constant speed) when the magnetic force of the magnetic field on the induced current in the bar balances the downward force due to the gravitational pull of the earth.

1)

develop in symbols an expression for the current through the bar as it falls.

express your answer in terms of the variables r, b, l, and terminal falling velocity v.