The formula for temperature coefficient of resistance is
\(\alpha\) = ΔR/R0 ΔT
where R is R  R0, where R0 is the resistance at reference temperature usually at 0°C or 20°C.
ΔT is T  T0, again T is 0° or 20°C
when written explicitly we get
\(\alpha\) = (R  R0)/R0 (T  T0)
But while measuring temperature coefficient of resistance of the material of the coil, in metre bridge experiment,
we use the relation \(\alpha\) = R2  R1/(R1t2 R2t1).
How R1 and R2 comes in this relation, whereas in the original formula there is only R0.
\(\alpha\) = ΔR/R0 ΔT
where R is R  R0, where R0 is the resistance at reference temperature usually at 0°C or 20°C.
ΔT is T  T0, again T is 0° or 20°C
when written explicitly we get
\(\alpha\) = (R  R0)/R0 (T  T0)
But while measuring temperature coefficient of resistance of the material of the coil, in metre bridge experiment,
we use the relation \(\alpha\) = R2  R1/(R1t2 R2t1).
How R1 and R2 comes in this relation, whereas in the original formula there is only R0.
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