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Questions  

A light emitting diode has a voltage drop of 2 volt across it and passes a current of 10mA,  when it operates with a 6 volt battery through a limiting resistor R.  The value of R is

a
40kΩ
b
4kΩ
c
200Ω
d
400Ω

detailed solution

Correct option is D

Potential Drop across R = E - Vled=6-2=4 VOhm's Law : R=P.Dcurrent=6−210×10−3=400Ω

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