Question

(a) What is the direction of the force on a wire carrying a current due east in a location where the Earth's field is due north? Both are parallel to the ground. up (b) Calculate the force per meter (in N/m) if the wire carries 15.0 A and the field strength is 5.50 x 10-ST. (Enter the magnitude.) 8.25e-04 ✔ N/m (c) What diameter (in m) iron wire would have its weight supported by this force? (The density of iron is 7.8 x 10 kg/m .) /m) and the voltage per meter (in V/m) needed. (The resistivity of iron is 9.71 x 100 m.) (d) Calculate the resistance per meter (in resistance per meter voltage per meter

Answer 1

e-m m=evzemohl F = mg=en&lg - F/L=IB - ③ from and I F/L 1B Veits 9te 4 15(5.5x10s) 7800 x 19.8 - 5.86x10 sm d=28=1172X104 m R-et - eL - 9.71x108 6L (b) ( R = et = her - IT (5.86810) R-19 s/m v c, v=IR VaR & = 15(9)=1135 V/ml