In the given figure, a diode D is connected to an external resistance \[R=100\,\Omega \] and an, e.m.f of 3.5 V. If the barrier potential developed across the diode is 0.5 V, the current in the circuit will be [NEET (Re) 2015] |
A) 30 mA
B) 40 mA
C) 20 mA
D) 35 mA
Correct Answer: A
Solution :
Given, external resistance \[R=100\,\Omega \] and an emf is 3.5 V. |
Potential barrier across the diode is 0.5 V, |
Potential difference on |
\[R=3.5V-0.5V=3.0V\] |
Current in circuit, |
\[I=\frac{V}{R}=\frac{3}{100}=0.03A=30mA\] |
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