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The maximum rated power of the LED is 2 mW and it is used in the circuit with input voltage of 5 V a

The maximum rated power of the LED is 2 mW and it is used in the circuit with input voltage of 5 V as shown in the figure below. The current through resistance Rs is 0.5 mA. The minimum value of the resistance of Rs, to ensure that the LED is not damaged is______kΩ. (1) 6 (2) 2 (3) 4 (4) 5
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