problem A wire 4.00 m long and 6.00 mm in diameter has a resistance of 15.0 m2.

Question

problem

A wire 4.00 m long and 6.00 mm in diameter has a resistance of 15.0 m2. A potential difference of 22.0 v is applied between the ends Resistivity, p Temperature Coefficient of Resistivity, a(K-1) Material (2 m) Typical Metals 41 x 10-3 Silver 1.62 x 10 43 x 10-3 1.69 x 10 Copper 40 x 10-3 2.35 x 10-8 Gold 4.4 x 10 2.75 x 10 Aluminum 4.82 x 10-s 0.002 x 10-3 Manganin 4.5 x 10-3 5.25 x 10 s Tungsten 6.5 x 10-3 9.68 x 10 106 x 10-s 3.9 x 10-3 Platinum "An alloy specifically designed to have a small value of a (a) What is the current in the wire? X A Enter umber (b) What is the current density?

Explanation / Answer

A)Current= V/R
      =22/0.015
       =1466.67 A
B)
Currrent density=current/area
              =1466.67/(pi*0.003^2)
              =51872722.19 A/m^2

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