Two resistors are connected in series. At \( 0^{\circ} \mathrm{C} \), the values of first and se...

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Two resistors are connected in series. At \( 0^{\circ} \mathrm{C} \), the values of first and second resistor are respectively \( \mathrm{R} \) and \( 2 \mathrm{R} \). The temperature coefficient of resistances of first and second resistors are \( \alpha \) and \( 2 \alpha \) respectively. The equivalent temperature coefficient of the resistor for the combination is
(1) \( \frac{5 \alpha}{4} \)
(2) \( \frac{4 \alpha}{3} \)
(3) \( \frac{4 \alpha}{5} \)
(4) \( \frac{5 \alpha}{3} \)
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