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arelay is to controlled by photocells with the charecteristics shown. the circuit delivers 10mA at 30v...

arelay is to controlled by photocells with the charecteristics shown. the circuit delivers 10mA at 30v setting when the cell is illuminated with 400 ll/m^2 the circuit becomes deenergized when the cell is dark. find the required series resistance and find the level of the dark

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