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Two resistors with temperature coefficie...

Two resistors with temperature coefficients of resistance `alpha_1` and `alpha_2` have resistances `R_(01)` and `R_(02) ` at `0^@C`. Find the temperature coefficient of the compound resistor consisting of the two resistors connected.
a.. In series and
b. in paralllel

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The correct Answer is:
`(alpha_(1)R_(01)+ alpha_(2)R_(02))`/(R_(01)+R_(02)`
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