Question
In the given figure, a diode D is connected to an external resistance R = 100 Ω 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 
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30 mA
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40 mA
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20 mA
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35 mA
Solution
A.
30 mA
Given, external resistance R = 100 Ω and an emf is 3.5 V.
Potential barrier across the diode is 0.5 V
Potential difference on R = 3.5 V - 0.5 V = 3.0 V
Current in circuit, I = V/R = 3/100
= 0.03 A = 30 mA
