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54. assignment (heating coil)

A portion of Nichrome wire of radius 2.70 mm is to be used in winding a heating coil. If the coil must draw a current of 8.70 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 ohm · m.)


(a) the required resistance of the coil
1 ohm

(b) the length of wire you must use to wind the coil
2 m

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