Two infinitely long solenoids thread a circuit. the magnitude of b inside each solenoid is the same and is 300 t at time t = 0. bin bout il im ir r2 rl rm rr r1 a a a what is the magnitude of the current im in middle resistor rm? a = 0.7 m , r1 = 0.2 m , r2 = 0.1 m , ∆b ∆t = 160 t/s , rl = 8.4 ω , rm = 5.9 ω , and rr = 1.1 ω . answer in units of a.