JEE Main | 2018Current Electricity and Electrical InstrumentHard

Question

The reading of the ammeter for a silicon diode in the given circuit is :-

Options

15 mA

11.5 mA

13.5 mA

Solution

Silicon diode is in forward bias.
Hence across diode potential barrier
$âˆ†$ V = 0.7 volts
$I = \frac{V - âˆ† V}{R} = \frac{3 - 0.7}{200}$
$= \frac{2.3}{200} = 11.5 Â m A$

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