3. 4. A-ZD 8-39 (-139 0-12 Two wires, 4:: and b, are made of the same metal and have equal length, but the resistance of wire a is D Q the resistance of wire I) is B Q. How do their diameters compare? ([0 points) When a potential difference is applied to a certain copper wire, a current of 0/5 A passes through the wire. If the wire was removed from the circuit and replaced with a copper wire of twice the cross-sectional area. what current would flow through the new wire? Assume the wires are identical in all other aspects. (15 points) . Suppose at 8C the resistance of a platinum resistance thermometer is C (2. When placed in a particular solution. the resistance is D+100 51. What is the temperature of this solution? Temperature Coefcient of resistivity for platinum is 3.93 x 10" l/\"C. (15 points) . A voltage D V is applied to a device of resistance R; and the current through the device is i'. lfthe device obeys Ohm's law, what will be the outcome if the voltage is increased to 2D V? (10 points) . Two identical resistors are connected in series across the terminals of a battery with a voltage V and a current I flows through the circuit. If one of the resistors is removed from the circuit and the remaining one connected across the terminals of the battery. how much current would flow through the circuit? (10 points) . The gure shows cross sections through three long conductors of the same length and material, with square cross sections of edge lengths as shown. Conductor B ts snugly within conductor A, and conductor C ts snugly within conductor B. Rank the resistance of A. B, and C '.' (10 points) JEL JEL ______ I: _|:|