1) A 0.20 A current flows through a wire of radius 0.500 mm and a length of 2 m. If the resistivity () of the wire's material (copper) is 1.68108m, what is the resistance of this wire? 2) A steady current of I=10 mA flows through a resistor in a circuit. How much charge flows through the resistor in 2 minutes? 3) An electric potential of V=7.52 V is placed across a thin silver wire with a cylindrical cross-section whose radius is r Au=19.4m and whose length is l=1.26 m. The resulting current through the wire is I=444 mA. In order to save money, the silver is being replaced with graphite. The potential V across the graphite wire and the current through it must remain the same as before. The length of the wire must also remain the same. The only parameter you may change is the radius of the wire. The resistivity of silver is Ag=1.59108mm and the resistivity of graphite is g=5.60105m. What must be the radius rg of the graphite wire? 4) Suppose that we place 10 V across a conducting wire with a diameter of d=1.4 mm. The wire has a resistance of R=250. What is the magnitude of the current density inside the wire? 5) A copper wire of length 4 m and a 2 mm diameter has a resistance of 0.05 at room temperature. Specify whether the following changes will increase or decrease the resistance of the wire. Increase Decrease Increasing the length to 5 m. Decreasing the length to 2 m. Decreasing the diameter. Increasing the temperature to 200 C. Decreasing the temperature to 0 C. 6)A certain resistor has a resistance of R=4.24k. If V=56.2 Volts Of electric potential is placed across this resistor, what is the current II through the resistor