Constants Part A An overhead transmission cable for electrical power is 2000 m l
ID: 2031033 • Letter: C
Question
Constants Part A An overhead transmission cable for electrical power is 2000 m long and consists of two parallel copper wires, each encased in insulating material. A short circuit has developed somewhere along the length of the cable where the insulation has worn thin and the two wires are in contact. As a power-company employee, you crews can be sent to that location. Both ends of the cable have been disconnected from the power grid At one end of the cable (point A), you connect the ends of the two wires to a 9.00-V battery that has negligible internal resistance and measure that 2.66 A of current flows through the battery. At the other end of the cable (point B), you attach those two wires to the battery and measure that 1.85 A of current flows through the battery How far is the short from point A? Express your answer to two significant figures and include the appropriate units must locate the short so that repair d-731.7 m SubmitPrey X Incorrect, Try Again; 5 attempts remaining ious Answers Request Answer Provide Feedback Next >Explanation / Answer
Here ,
let the distance from the point is A is x
distance from point B is 2000 - x
as the resistance is directly proportional to length
for same voltage , current will be inversely proportional to length
I1/I2 = L2/L1
2.66/1.85 = (2000 - x)/x
solving for x
x = 820.4 m
the short circuit is 820.4 m from the point A