Question

Two resistors have resistances $R_{01}$ and $R_{02}$ at $0^{\circ }C$ and temperature co -efficient $\propto 1$ and $\propto 2$. Find the value of $\propto$ for their series combination.

• A. ${\propto }_1+{\propto }_2$
• B. ${\propto }_1-{\propto }_2$
• C. $\frac{R_{01}{\propto }_1+R_{02}{\propto }_2}{R_{01}+R_{02}}$
• D. $\frac{R_{01}{\propto }_2+R_{02}{\propto }_1}{R_{01}+R_{02}}$

Answer 1

The correct option is C $\frac{R_{01}{\propto }_1+R_{02}{\propto }_2}{R_{01}+R_{02}}$