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Question(s) / Instruction(s):

A portion of Nichrome wire of radius 2.60 mm is to be used in winding a heating coil. If the coil must draw a current of 9.90 A when a voltage of 120 V is applied across its ends, find the following. (Take the resistivity of nichrome to be 1.50 10-6 Ω • m.)
(a) The required resistance of the coil in Ω
(b) The length of wire you must use to wind the coil in m
(C) A 0.700-V potential difference is maintained across a 1.50-m length of tungsten wire that has a cross-sectional area of 0.600 mm2. What is the current in the wire?

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