A) \[40\,\,k\Omega \]
B) \[4\,\,k\Omega \]
C) \[200\,\,k\Omega \]
D) \[400\,\,k\Omega \]
Correct Answer: D
Solution :
The term LED is abbreviated as Light Emitting Diode. It is forward-biased p-n junction which emits spontaneous radiation. Current in the circuit \[=10\,mA=10\times {{10}^{-3}}A\] and voltage in the circuit \[=6-2=4\,V\] From Ohms law, \[V=IR\] \[\therefore \] \[R=\frac{V}{I}=\frac{4}{10\times {{10}^{-3}}}=400\,\,\Omega \]
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