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

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

`200 Omega`

`6.67 Omega`

`5 Omega`

`1.5 Omega`

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