An experiment is conducted to measure the electrical resistivity of nichrome in the form of wires of different lengths and cross-sectional areas. For one set of measurements, a student uses a 30-gauge wire of cross-sectional area 7.3108m21%.7.3108m21%. The student measures the potential difference across the wire and the current in the wire using a voltmeter and an ammeter, respectively. If the relative error in each of the instruments used by the student to measure length, potential difference and current is 1%1% calculate the average value of resistivity.
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