A 1.50-m cylindrical rod of diameter 0.500 cm is connected to a power supply that maintains a constant potential difference of 15.0 V across its ends, while an ammeter measures the current through it. You observe that at room temperature (20.0°C) the ammeter reads 18.5 A. while at 92.0°C it reads 17.2 A. You can ignore any thermal expansion of the rod. Find (a) the resistivity at 20.0°C and (b) the temperature coefficient of resistivity at 20°C for the material of the rod.
A 1.50-m cylindrical rod of diameter 0.500 cm is connected to a power supply that maintains a constant potential difference of 15.0 V across its ends, while an ammeter measures the current through it. You observe that at room temperature (20.0°C) the ammeter reads 18.5 A. while at 92.0°C it reads 17.2 A. You can ignore any thermal expansion of the rod. Find (a) the resistivity at 20.0°C and (b) the temperature coefficient of resistivity at 20°C for the material of the rod.
A 1.50-m cylindrical rod of diameter 0.500 cm is connected to a power supply that maintains a constant potential difference of 15.0 V across its ends, while an ammeter measures the current through it. You observe that at room temperature (20.0°C) the ammeter reads 18.5 A. while at 92.0°C it reads 17.2 A. You can ignore any thermal expansion of the rod. Find (a) the resistivity at 20.0°C and (b) the temperature coefficient of resistivity at 20°C for the material of the rod.
A 1.50 m cylindrical rod of diameter 0.500 cm is connected to a power supply that maintains a constant potential difference of 15.0 V across its ends, while an ammeter measures the current through it. You observe that at room temperature ( 20.0°C) the ammeter reads 18.5 A, while at 92.0°C it reads 17.2 A. You can ignore any thermal expansion of the rod. Find (a) the resistivity at 20.0°C and (b) the temperature coefficient of resistivity at 20°C for the material of the rod.
A 1.50 m cylindrical rod of diameter 0.500 cm is connected to a power supply that maintains a constant
potential difference of 15.0V across its ends, while an ammeter measures the current through it. You observed
that at room temperature ( 20°C) the ammeter reads 18. 5 A, while at 92.0° C it reads 17.2 A.
a). Which of the following is its resistivity at 20°C?(p). [Select ]
in N.m.
15. A 2.50-m cylindrical rod of diameter 0.500 cm is connected to a power supply that maintains a constant potential
difference of 18.0 V across its ends, while an ammeter measures the current through it. You observe that at room
temperature (20.0°C) the ammeter reads 18.8 A, while at 92.0°C it reads 17.1 A. You can ignore any thermal expansion
of the rod. Find the resistivity in μm at 20.0°C. Round-off to the nearest hundredth.
Chapter 25 Solutions
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