A Zener voltage regulator circuit is to maintain constant voltage at 60 V, over a current range frome 5 to 50 mA. The input supply voltage is 200 V. Determine the value of resistance R to be connected in the circuit, for voltage regulation from load current I_{L} = 0 mA to I_{L} max, the maximum possible value of I_{L}. What is the value of I_{L} max?