Recent content by g98

  1. g98

    To reduce cost and weight, power transmission lines are made

    I was wondering for the formula R=p(l/A) (p being the specificity) what should be the units of the area? i though it should be m^2 but i checked in internet and in many places i saw mm^2 and i got slightly confused
  2. g98

    To reduce cost and weight, power transmission lines are made

    The thing i didn't mention is that the wire is aluminium and the diameter is 4cm
  3. g98

    To reduce cost and weight, power transmission lines are made

    Homework Statement Determine the resistance of a 30 km long wire. b. Assume that the line transfers 1000 MW of power at a potential difference of 500 kV. What is the current through the wires? c. How much power is lost during transmission? What fraction of the transmitted power is lost...
  4. g98

    Find charge inner/hollow sphere

    Homework Statement A hollow conducting sphere with an inner radius of 5 cm and an outer radius of 6 cm contains a smaller sphere of radius 3 cm, located symmetrically inside the hollow sphere. The electric field strength at 4 cm from the center is measured to be 2400 N/C pointing inward. The...