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A silicon p-n junction diode whose knee ...

A silicon p-n junction diode whose knee voltage is `0.7 V` is connected to a battery with supply voltage `3V` and `100mA` in forward biasing. If a resistor R is used in series of the circuit, then a current of 20mA passes through the diode. Find the wattage of the resistor and of the diode.

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