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BITSAT 2020

Exam: BITSAT
Year: 2020
Subject: Physics
Chapter: Semiconductors

BITSAT 2020 · Physics · Semiconductors

If the forward voltage in a semiconductor diode is changed from 0.5...

If the forward voltage in a semiconductor diode is changed from

0.5 \mathrm{ V}

to

0.7 \mathrm{ V}

, then the forward current changes by

1.0 \mathrm{ mA}

. The forward resistance of diode junction will be

Options

A $100 \Omega$
B $120 \Omega$
C $200 \Omega$
D $240 \Omega$

Correct answer

C. $200 \Omega$

Step-by-step solution

Forward resistance

=\frac{\Delta \mathrm{V}}{\Delta

\mathrm{I}

}=\frac{0.7-0.5}{1.0 \times 10^{-3}}=200 \Omega

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