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Q.

A diode made of silicon has a barrier potential of 0.7V and a current of 20 mA passes through the diode when a battery of emf 3 volts is connected to it along with a resistor in series, then the wattage of the resistor is

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a

14 W

b

46 W

c

46 m W

d

14 m W

answer is B.

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Detailed Solution

P=VI=(3−0.7)X 20=46mW

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