1. A 1.40 m cylindrical rod of diameter 0.550 cm is connected to a power supply that maintain a constant potential difference of 14.0 V across its ends. At room temperature (20.0 .C) ammeter connected in the circuit reads 18.8 A. What is the resistivity of the material of the rod at 20.0 C? [Hint: first find resistance at 20.0 .C using Ohm's law] Ans- 1.26x10-5 0.m 2. The temperature coefficient of resistivity of the material of the rod in Q. 1 is a = 1.12 x 10 3 (C) What is the resistance of the rod at temperature 92.0 C ? Ans: 0.805 0