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A silicon $\text{PN}$ junction is forward biased with a constant current at room temperature. When the temperature is increased by $10^{\circ} \mathrm{C}$, the forward bias voltage across the $\text{PN}$ junction

  1. increases by $60 \; \mathrm{mV}$
  2. decreases by $60 \; \mathrm{mV}$
  3. increases by $25 \; \mathrm{mV}$
  4. decreases by $25 \; \mathrm {mV}$
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