7. What is the value of the diameter in millimeter of a certain wire having a resistance of 0.56 0, 40 meters in length and 2 mm? in cross section? A 200 meter length of wire of the same material has a resistance of 2 Q at the same temperature.

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7. What is the value of the diameter in millimeter of a certain wire having a
resistance of 0.56 Q, 40 meters in length and 2 mm? in cross section? A 200
meter length of wire of the same material has a resistance of 2 Q at the same
temperature.
8. Determine the resistance of a 1.25 km long cable composed of 14 strands of
similar copper wire conductor; each strand is 1.3 mm in diameter. Allow a 5.4%
increase in length for the twist of each strand in completed cable. The specific
resistance of copper is 1.72 x 10 -* Q-m.
Transcribed Image Text:7. What is the value of the diameter in millimeter of a certain wire having a resistance of 0.56 Q, 40 meters in length and 2 mm? in cross section? A 200 meter length of wire of the same material has a resistance of 2 Q at the same temperature. 8. Determine the resistance of a 1.25 km long cable composed of 14 strands of similar copper wire conductor; each strand is 1.3 mm in diameter. Allow a 5.4% increase in length for the twist of each strand in completed cable. The specific resistance of copper is 1.72 x 10 -* Q-m.
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