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In the circuit shown in Fig, D 1 is a large-area, high-current diode whose reverse leakage is high and independent of applied voltage, while D 2 is a much smaller, low-current diode. At an ambient temperature of 20 ° C,resistor R 1 is adjusted to make V R1 =V 2 =520 mV. Subsequent measurement indicates that R 1 is 520 kΩ. What do you expect the voltages V R1 and V 2 to become at 0 ° C and at 40 ° C?

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