The diode used in the circuit shown in t...

The diode used in the circuit shown in the figure has a constant voltage drop at 0.5 V at all currents and a maximum power rating of 100 mW. What should be the value of the resistor R, connected in series with diode, for obtaining maximum current ?

`6.76 Omega`

`20 Omega`

`5 Omega`

`5.6 Omega`

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