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- 7. The resistivity of seawater is p= 25 2.cm and the number of charges per volume is 6 × 1020 ions/ cm3 each with charge q 1.6 x 10-19 C. If we fill a tube 2 m long with seawater and connect a 12-volt battery, what is the resulting average drift velocity of the ions (Answer in cm/s)?1. The total charge entering a terminal is given by q = 2e² cos (6nt), in µC. Determine the current at t= 0.25 s. 2. The resistance of a certain conductor , 300 mil diameter and 20 ft long is 200 x10^-3 N. Calculate its resistivity in micro-ohms-meter (µ2-m). 3. Determine the thermal coefficient of resistance of copper at 50°C, then use this value to determine the resistance of copper wire at 170°F if the resistance of this copper wire at 50°C is 50 0. The thermal coefficient of resistance of copper at 0°C is 0.004264/C°. 4. A battery has an EMF of 24.0 V and an internal resistance of 'r'. Its terminals are connected to a load resistance of 5.25 N. a. Find r and current in the circuit if the terminal voltage of the battery is 22.5V. b. Calculate the power delivered to the load resistor, the power delivered to the internal resistance, and the power delivered by the battery. 5. A 220V 600-watt electric coffee maker is used to make a total of 10 cups of coffee in 45 minutes. Determine the…2. An Iron wire at 0 Celcius has resistivity Ro. At which temperature the resistiv- ity of this wire will be 1.2Ro. You can find the value temperature coefficients of resistivity from Table 25.2 from your book. Explain the physical mechanism of rising resistivity by the rising temperature.