What is the new resistance of the wire
A wire of initial length L0 and radius r0 has a measured resistance of 1.0 . The wire is drawn under tensile stress to a new uniform radius of r = 0.45r0. What is the new resistance of the wire?
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Nichrome wire of cross-sectional radius 0.786 mm is to be used in winding a heating coil. If the coil must carry a current of 9.50 A when a voltage of 2.10 102 V is applied across its ends, find the following. (a) the required resistance of the co
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