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JEE Main 2020 (3 Sep, Shift 1) · P-N Junction Diode

P-N Junction Diode question from JEE Main 2020 (3 Sep, Shift 1)

Q81JEE Main 2020 · 3 SEP · SHIFT 1Easy

P-N Junction Diode

When a diode is forward biased, it has a voltage drop of 0.5 V. The safe limit of current through the diode is 10 mA. If a battery of emf 1.5 V is used in the circuit, the value of minimum resistance to be connected in series with the diode so that the current does not exceed the safe limit is

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Answer: (d)

Voltage across series resistor $= 1.5 - 0.5 = 1.0\text{ V}$ .
$R_{min} = \dfrac{1.0}{10 \times 10^{-3}} = 100\ \Omega$
So the answer is (d) $100\ \Omega$ .

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