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Q.

When a diode is forward biased, it has a voltage drop of 0.5 V. The safe limit of current through the diode is 10 mA. If a battery of emf 1.5 V is used in the circuit, the value of minimum resistance to be connected in series with the diode so that the current does not exceed the safe limit is :

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a

200Ω

b

50Ω

c

100Ω

d

300Ω

answer is C.

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Detailed Solution

Applying KVL, ​1.5−0.5−iR=0​⇒R=110×10−3=100Ω
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