(1) a 500W heating coildesigned to operate from 120V is made of nichrome wire 0.
ID: 1674363 • Letter: #
Question
(1) a 500W heating coildesigned to operate from 120V is made of nichrome wire 0.5mm indiameter. assuming the resistivity of the nichrome remainsconstant at its 200C value, find the length of the wireused. (2) a 0.200kg metal rod carrying a current of 10A glides ontwo horizontal rails 0.5m apart. what vertical magnetic field isrequired to keep the rod moving at a constant speed if thecoefficient of kinetic friction between the rod and rail is0.1? (1) a 500W heating coildesigned to operate from 120V is made of nichrome wire 0.5mm indiameter. assuming the resistivity of the nichrome remainsconstant at its 200C value, find the length of the wireused. (2) a 0.200kg metal rod carrying a current of 10A glides ontwo horizontal rails 0.5m apart. what vertical magnetic field isrequired to keep the rod moving at a constant speed if thecoefficient of kinetic friction between the rod and rail is0.1?Explanation / Answer
1)power P = 500 W voltage V = 120 V we know P = V ^ 2 / R resistance R = V ^ 2 / P = ___ diameter of wire d = 0.5 * 10 ^ -3 m Area of cross section A = d^2 / 4 = ___ m ^ 2 we know R = L / A from this length of the wire L = R A / where = resisitivity of nichrome = 108 * 10 ^ -8ohm - m use the values to get L = ___ m
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