In the given figure, a diode D is connected to an external resistance 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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Solution

Q.
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

1 20 mA

2 35 mA

3 30 mA

4 40 mA

Ans.
(3)

The potential difference across the resistance $R$ is

$V = 3.5$ $V - 0.5$ $V = 3$ $V$

By Ohm’s law,

the current in the circuit is

$I = \frac{V}{R} = \frac{3 V}{100 Ω} = 3 \times 10^{- 2} A = 30 \times 10^{- 3} A = 30$ $mA$

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