Question - An unknown length of platinum wire 0.760mm in diameter is placed as the unknown resistance in a Wheatstone bridge (see the figure). Arms 1 and 2 have resistance of 38.0Ω and 55.0Ω, respectively. Balance is achieved when R3 is 3.63 Ω. Resistivity of platinum is 10.6 x 10-8.
How long is the platinum wire?