Find the electric field and the resistivity of a 400cm long wire having a diameter of 0.4cm and carrying I= 3A and having a Δ V = 4 V

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Find the electric field and the resistivity of a 400cm long wire having a diameter of 0.4cm and carrying I= 3A and having a   Δ  V  =  4  V

darkangel5991we · Accepted Answer

The electric field is given by   E  =      V    d  where, V is the voltage, d is the distance. The resistance is given by   R  =  ρ      L    A  where, L is the length, A is the area and   ρ is the resistivity. I = 3 A, V = 4 VLength, L = 400 cm = 4 m, diameter, d = 0.4 cm, radius, r =  0.2 cmLet the electric field is E.   E  =      4    4    =  1  N      /    CThe resistivity is given by       V    I    =  ρ      L    A      ρ  =            V      A              I      L          ρ  =            4      ×      3.14      ×      0.2      ×      0.2      ×              10                  −          4                            3      ×      4        =  4.2  ×      10          −      6           o  h  m     m

Find the electric field and the resistivity of a 400cm long wire having a diameter of 0.4cm and carrying I= 3A and having a Delta V= 4V.

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