Assume a 46 ft pole with a 24 in. circumference at the pole top and a 50 in. cırcumference at ground level. Also assume a wind velocity of 60 mph and an average span of 250 ft. The pole carries two crossarms, and each crossarm carries three conductors. The top crossarm is 1 ft below the pole top, and the lower crossarm is 2 ft below the top crossarm. Use hard-drawn copper conductors of 250 kcmil with 12 strands and 4/0 with 7 strands for the top and lower conductors, respectively. Assume that 6.5 ft of the pole is below the ground and find the total pressure of wind on pole and on conductors.

Part (a)  Find the direction of the force for wire A in degrees. Measure this angle counterclockwise, in degrees, from the positive x-axis. θA = ______ Part (b)  Find the direction of the force for wire B, in degrees. Measure this angle counterclockwise, in degrees, from the positive x-axis.   θB = ______ Part (c)  Find the direction of the force for wire C, in degrees. Measure this angle counterclockwise, in degrees, from the positive x-axis. θC = ______

A cylindric mica insulator to be used between a 100 kV DC line and ground has a diameter of 5 cm. The insulator is expected to prevent currents of more than 1 nA^1 . Find the minimum required length of the porcelain cylinder.

the rate of charge (q) flowing in a piece of copper wire is 0.0032 c at a cross -sectional surface area in 15ms. How much current I(mA) is flowing in the circuit ?

A coil is formed by winding 330 turns of insulated 16 gauge copper wire (diameter = 1.9 mm) in a single layer on a cylindrical form of radius 12 cm. What is the resistance of the coil? Neglect the thickness of the insulation. (Take the resistivity of copper to be 1.69 × 10-8 ohm-m.)