Platinum has a resistivity of Qm. a) If it is made into a wire 55 m long and 0.5 mm in diameter, what is its resistance? R = 29.69 b) If you had a wire 1.5 mm diameter and needed a resistance of 9.4 Q, how long should you cut the wire? 156.71 m c) Regarding the last answer, that is way to long to be convenient. If you made it out of a different material it could be shorter. What resistivity would give you the same 9.4 Q resistance with a length of only 55 cm. Enter in scientific notation. 6 3.4 10 X