A rigid steel bar $\mathrm{ABC}$ is pinned at $\mathrm{B}$ and supported by two rods. No strain exists in the rods before load $\mathrm{P}$ is applied. After load $\mathrm{P}$ is applied, the normal strain in rod $\left(1\right)$ is $+910 \mathrm{\mu \epsilon }$.

Determine the normal strain in rod $\left(2\right)$.