When tension is applied to a metal wire of length L , it stretches by Δ L . If the same tension is applied to a metal wire of the same material with the same cross-sectional area but of length 2 L , by how much will it stretch?

Atoaster oven has a resistive heating element. the average rate at which it dissipates energy as thermal energy is 1.00 \(\rm kw\). in the united states, emf amplitude in household circuits is \(\mathcal e_{\max}\) = 170 \({\rm \; v}\) and the \(\rm ac\) oscillation rate is 60 \(\rm hz\). part a what is the root-mean-square current through the heating element?