# Capa5 - 1[1 point 10 tries A small sphere that carries a...

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1 . [1 point, 10 tries] A small sphere that carries a charge of 7.64×10 -9 C is whirled in a circle at the end of an insulating string. The angular frequency of rotation is 113.8 rad/s. What average current does this rotating charge represent? Answer: 1.38e-07 A 1 2 . [1 point, 10 tries] A high-voltage transmission line with a diameter of 2.39 cm and a length of 219 km carries a steady current of 1076 A. If the conductor is copper wire with a free charge density of 7.99×10 28 electrons/m 3 , how long does it take one electron to travel the full length of the cable? Answer: 1.17E+09 s 1 3 . [1 point, 10 tries] An electric current is given by the expression I ( t ) = 118 sin (137π t ), where I is in amperes and t is in seconds. What is the total charge carried by the current from t = 0 to t = 1/259 s? Answer: 2.99E-01 C 1 4 . [1 point, 10 tries] Aluminum and copper wires of equal length are found to have the same resistance. What is the ratio (Al to Cu) of their radii? Answer: 1.29e+00 1 5 . [1 point, 10 tries] A wire with a resistance 231.00 Ω is lengthened to 1.54 times its original length by being pulled

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