Safari File Edit View History 10 points SerCP11 17 ge power lines are a common s

Question

Safari File Edit View History 10 points SerCP11 17 ge power lines are a common sight. The copper wire on which a bird stands is 20 om in ameter and camies a current of Sz A. If the bird's calculate the potential diffdrence between its feet. The istvi feet are 1.9 cm apart, Need Help? Lot 15. 40140 points 1 Previous Aniswers SerCP11 17 P0ST An experiment is conducted to measure the electrical resistivity of Nichrome in the form of wires with different lengths and cross-sectional areas. For ane sot of uses 30 gauge wire, which has a cross-sectional area of 7.30 x 10m2. The student measures the potential difference across the wire and the current in ammeter, respectively. For each of the measurements given in the following table taken on wires of three difterent lengths, calculate the resistanoe of the wires and the of the resistivity the wire with a voltmeter and

Explanation / Answer

14] The cross-section of the wire is = pi*r^2

= pi*(0.01)^2 m^2

So, the current density is

j = 52 / (pi*(0.01)^2)

= 165521 A / m^2

With a resistivity s = 1.7*10^-8 ohm m, this corresponds to an electric field

E = s*j

= 1.7*10^-8*165521

= 0.0028 V/m

The potential difference over a length L = 0.039 m is

U = L*E

= 0.039*0.0028

= 0.0001092 V

= 109.2 uV

The potential across the body of the bird is thus roughly 109.2 V

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