A metal wire 3.50 m long has a circular cross section of radius 0.54 mm and an end-to-end resistance of 70.0 Ohms. The metal wire is then stretched uniformly so that its cross-section is still circular but its total length is now 22.75 m. What is the resistance of the wire after stretching? (Units: Ohm.) (I keep getting 455 Ohm, but that is incorrect.)
Ohm's law
Ohm’s law is a prominent concept in physics and electronics. It gives the relation between the current and the voltage. It is used to analyze and construct electrical circuits. Ohm's law states that the voltage across a conductor is directly proportional to the current flowing through it.
Path of Least Resistance
In a series of alternate pathways, the direction of least resistance is the actual or metaphorical route that offers the least resistance to forwarding motion by a given individual or body.
A metal wire 3.50 m long has a circular cross section of radius 0.54 mm and an end-to-end resistance of 70.0 Ohms. The metal wire is then stretched uniformly so that its cross-section is still circular but its total length is now 22.75 m. What is the resistance of the wire after stretching? (Units: Ohm.)
(I keep getting 455 Ohm, but that is incorrect.)
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