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Q.

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  of  100 milliwatts. What should be the value of the resistance R, connected in series with the diode for obtaining maximum current?

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a

1.5 Ω

b

5 Ω

c

6.67 Ω

d

200 Ω

answer is B.

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Detailed Solution

The current through circuiti=PV=100×10-30.5=0.2 A∴ Voltage drop across resistance = 1.5 - 0.5 = 1 V⇒R=10.2=5 Ω
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