JEE PYQ: Semiconductors Question 17
Question 17 - 2020 (03 Sep 2020 Shift 1)
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:
(1) $300\ \Omega$
(2) $50\ \Omega$
(3) $100\ \Omega$
(4) $200\ \Omega$
Show Answer
Answer: (3)
Solution
$V_R = 1.5 - 0.5 = 1$ V. $R_{min} = 1/(10 \times 10^{-3}) = 100\ \Omega$.
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