a zener diode exhibits a constant voltage of 5.6 volts for currents greater than five times the knee current.Izk is specified to be 1 ma. the zener is to be used in the design of a shunt regulator fed from a 15 volts supply . the load current varies over range of 0 ma to 15mA . find a suitabe value for resistor R. what is the meaximum power dissipation of the zener diode.