What is the formula of the ratio of the lower limit to upper limit of current with respect to the resistance?(a) lower limit of current / upper limit of current = motor resistance / resistance to limit the starting current(b) lower limit of current / upper limit of current = (motor resistance / resistance to limit the starting current)^1/number of resistance(c) lower limit of current / upper limit of current = (motor resistance * resistance to limit the starting current)^1/number of resistance(d) lower limit of current / upper limit of current = motor resistance * resistance to limit the starting currentThis question was addressed to me in an interview for internship.I want to ask this question from Motor Starters, Calculation of Resistance Steps & Design of Field Regulators topic in section Design of Small Electrical Machines, Starters and Field Regulators of Design of Electrical Machines