Original Copper
Posted in Uncategorized on 09/02/2005 11:44 pm by admin

Two cylindrical rods, each with a diameter of 2.40 cm, are welded end to end. One of the bars of origin?
Two cylindrical rods, each with a diameter of 2.40 cm, are welded end to end. One of the original bar is copper and 0.370 m long. The iron bar and another is 0.185 m long. What is the resistance between the ends of the sealing bar at 20 ° C
I answered a question like today earlier, you use the equation R = pl / A p is the resistivity of the p metal (iron) = 1 * 10 ^ -7 p (copper) = 1724 * 10 ^ -8 L is the length of each bar A is the area of each bar and is considered a section of the area equation is A = (3.14) r ^ 2 They give you the diameter we must therefore divide by 2 to get the radius you have to also change the radius of R m cm (iron) = 1 * 10 ^ -7 * (.185 m) / (3.14 * .012 ^ 2 ) R ( copper) = 1.724 * 10 ^ -8 * (.370 m) / (3.14 * .012 ^ 2) R (iron) = 4.089 * 10 ^ -5 R (Copper) = 1.41 * 10 ^ -5 Since the two bars next of each other it is seen as a series so you add resistance and R = R (iron) + R (Copper) = 5.499 * 10 ^ -5 ohm
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