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1) let: V = change in V E = electric field I = current L = length of rod A = square cross-section R = resistance given equations (from physic): E = V / L I = V / R R = rho * L /A by that: E*L =V IR =V R = rho *L /A EL = I * rho * L /A E = I * rho /A E = 12
