Two wires A and B made from two different materials have temperature coefficient of resistance equal to 0.0025 and 0.0005 ohm per degree Celsius, respectively. It is desired to make a coil of wire having a resistance of 1200 ohms with a temperature coefficient of 0.001, using suitable lengths of the two given wires connected in series. Determine the required length of wire A. Solve with a complete solution.

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Two wires A and B made from two different materials have temperature
coefficient of resistance equal to 0.0025 and 0.0005 ohm per degree
Celsius, respectively. It is desired to make a coil of wire having a resistance
of 1200 ohms with a temperature coefficient of 0.001, using suitable lengths
of the two given wires connected in series. Determine the required length
of wire A. Solve with a complete solution.

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