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The reading of the ammeter for a silicon diode in the given circuit is [Figure: a 3 V cell, a silicon diode (forward biased), a 200 Ω resistor and an ammeter in series.]

Asked in JEE Main 2018 · Circuits with diodes

• (1) 0
• (2) 15 mA
• (3) 11.5 mA
• (4) 13.5 mA

Step-by-step solution

Why the other options are wrong

• (1) The diode is forward biased and the cell exceeds its 0.7 V drop, so current flows.
• (2) Ignores the 0.7 V diode drop: 3/200.
• (4) Uses a 0.3 V (germanium) drop instead of 0.7 V.

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