The resistance t R of a conductor varies...

The resistance t R of a conductor varies with temperature t as shown in the figure. If the variation is represented by `R_(t) = R_(0)[1+ alphat +betat^(2)]`, then

`alpha` and `beta` are both negative

`alpha` and `beta` are both positive

`alpha` is positive and `beta` is negative

`alpha` is negative and `beta` are positive

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