The resistance\[{{R}_{t}}\] of a conductor varies with temperature t as shown in the figure. If the variation is represented by \[{{R}_{t}}={{R}_{0}}[1+\alpha t+\beta {{t}^{2}}]\], then [CPMT 1988]

\[\alpha \] is positive and \[\beta \] is negative

\[\alpha \] and \[\beta \] are both negative

\[\alpha \] and \[\beta \] are both positive

\[\alpha \] is negative and \[\beta \] are positive

The resistance\[{{R}_{t}}\] of a conductor varies with temperature t a

1.	The resistance\[{{R}_{t}}\] of a conductor varies with temperature t as shown in the figure. If the variation is represented by \[{{R}_{t}}={{R}_{0}}[1+\alpha t+\beta {{t}^{2}}]\], then [CPMT 1988]
A.	\[\alpha \] and \[\beta \] are both negative
B.	\[\alpha \] and \[\beta \] are both positive
C.	\[\alpha \] is positive and \[\beta \] is negative
D.	\[\alpha \] is negative and \[\beta \] are positive
Answer» C. \[\alpha \] is positive and \[\beta \] is negative