If R1 and R2 are resistances of a given coil at temperatures t1 and t2, then temperature coefficient of resistance of the material is:
A. \(\frac{R_{1}-R_{2}}{R_{1} T_{2}-R_{2} T_{1}}\)
B. \(\frac{R_{2}-R_{1}}{R_{1} T_{2}-R_{2} T_{1}}\)
C. \(\frac{\mathrm{R}_{2}-\mathbf{R}_{1}}{\mathbf{R}_{2} \mathrm{~T}_{1}-\mathrm{R}_{1} \mathrm{~T}_{2}}\)
D. \(\frac{R_{1}-R_{2}}{R_{2} T_{1}-R_{1} T_{2}}\)
Answer:B
If R1 and R2 are resistances of a given coil at temperatures t1 and t2, then temperature coefficient of resistance of the material is:
A. \(\frac{R_{1}-R_{2}}{R_{1} T_{2}-R_{2} T_{1}}\) B. \(\frac{R_{2}-R_{1}}{R_{1} T_{2}-R_{2} T_{1}}\) C. \(\frac{\mathrm{R}_{2}-\mathbf{R}_{1}}{\mathbf{R}_{2} \mathrm{~T}_{1}-\mathrm{R}_{1} \mathrm{~T}_{2}}\) D. \(\frac{R_{1}-R_{2}}{R_{2} T_{1}-R_{1} T_{2}}\)