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A silicon 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 PN junction

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