A=29 B=39 C=139 D=12 B= D= Will be graded: 1. The figure shows cross sections through three long conductors of the same length and the same material, with square cross sections of edge lengths as shown. Conductor B fits snugly within conductor A, and conductor C fits snugly within conductor B. a. Calculate the cross-sectional area of each conductor in terms of L? (15 points) b. Rank the cross-sectional areas of A, B, and C? (15 points) c. Rank the resistance of A, B, and C? Explain how? (20 points) 2. Find the current i of the circuit? (25 points) Do for practice and earn (25 points) for completion: 3. Two wires, a and b, are made of the same metal and have equal length, but the resistance of wire a is D 2 the resistance of wire b is B 2. How do their diameters compare? 4. When a potential difference is applied to a certain copper wire, a current of D/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. Dr. Hetti PHY 116 5. Suppose at BOC the resistance of a platinum resistance thermometer is C $2. When placed in a particular solution, the resistance is D+100 2. What is the temperature of this solution? Temperature Coefficient of resistivity for platinum is 3.93 x 103 1/C. 6. A voltage D V is applied to a device of resistance R; and the current through the device is i. If the device obeys Ohm's law, what will be the outcome if the voltage is increased to 2D V? 7. Two identical resistors are connected in series across the terminals of a battery with a voltage I and a current / flow 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? 8. Two lightbulbs operate at 120 V, but one has a power rating of 25 W while the other has a power rating of 100 W. Which one has the greater resistance? What is the value of the peak voltage if you use 120 V AC power? What is the peak power consumption rate of the 25 W AC light bulb