Q90 / 125 · BITSAT 2020 · Physics

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

  • A
    $100 \Omega$
  • B
    $120 \Omega$
  • Correct answer
    C
    $200 \Omega$
  • D
    $240 \Omega$

Solution

Forward resistance $=\frac{\Delta \mathrm{V}}{\Delta \mathrm{I}}=\frac{0.7-0.5}{1.0 \times 10^{-3}}=200 \Omega$

Hence, the correct answer is option: 'C'.

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