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An unknown length of platinum wire is 0.920 millimeter in diameter is used as the unknown resistance in the Wheatstone bridge. R1 and R2 have resistance of 38.0 ohm and 46.0 ohm, correspondingly. Balance is achieved when Rs is 3.48 ohm.
A) Determine how long is the platinum wire?
B) Assume the platinum wire is removed and replaced with another platinum wire of the equal length but one third the diameter of the original. If R1 and R2 are not changed, determine what is the new value of Rs which will balance the circuit?
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