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- - If the heater wire is replaced by a wire with lower resistance, is the time required to heat the gas (a) unchanged,(b) increased, or (c) decreased?• W1A 9:r A Imssb1.mutah.edu.jo/mod/quiz Question 11 Not yet answered Marked out of 6 P Flag question A conductor has a cross-sectional area of 2.3x106 m² and the number of free electrons per unit volume is 8.5 x1028 electron/m3. When the current is 8.5 A, find the drift speed (in mm/s) of the electrons. Use the charge of the electron to be 1.6×1019 c. Select one: A. 0.19 B. 35.67 C. 0.27 D. 27.17 E. 0.36 Previous page Next page + IIExplain why birds can sit on power lines safely, eventhough the wires have no insulation around them, whereasleaning a metal ladder up against a power line is extremelydangerous.
- Using your understanding of the nature of internal energy and temperature, explain why we might expect the resistance of a solid to increase if its temperature increases.Integrated ConceptsHow much time is needed for a surgical cauterizer to raise the temperature of 1.00 g of tissue from 37.0oC to 100oC and then boil away 0.500 g of water, if it puts out 2.00 mA at 15.0 kV? Ignore heat transfer to the surroundings.•7 A fuse in an electric circuit is a wire that is designed to melt, and thereby open the circuit, if the current exceeds a predetermined value. Suppose that the material to be used in a fuse melts when the current density rises to 440 A/cm?. What diameter of cylindrical wire should be used to make a fuse that will limit the current to 0.50 A?
- Integrated Concepts How much time is needed for a surgical cauterizer to raise the temperature of 1.00 g of tissue from 37.0ºC to 100ºC and then boil away 0.500 g of water, if it puts out 2.00 mA at 15.0 kV? Ignore heat transfer to the surroundings.A resistor made from a wire of length L, cross sectional area A is connected to an ideal battery. (a) If we double the length of the wire (leaving the area, wire's material composition, and the battery as it was originally,) what happens to each of the following quantities? Recall the voltage across the resistor stays constant because it is connected directly to an ideal battery! • Does the current through the wire increase, decrease, stay the same, or is there insufficient information? • Does the current density in the wire increase, decrease, stay the same, or is there insufficient information? • Does the power dissipated in the wire increase, decrease, stay the same, or is there insuffi- cient information? . Does the electric field in the wire increase, decrease, stay the same, is there insufficient information? . Does the density of the charges in the wire increase, decrease, stay the same, or is there insufficient information? (b) if we instead double the radius and therefore the…- Would replacing the Nichrome with copper result in a higher current or lower current? - If the heater wire is replaced by a wire with lower resistance, is the time required to heat the gas (a) unchanged,(b) increased, or (c) decreased?
- in she mudh ah on from HAy machine orhode a cabmhing poentiel es G0 000V anIf a copper heating element is connected to a source of constant voltage, does the electrical power consumed by the heating element increase or decrease as its temperature increases? ExplainThe drift velocity inside a conductor is: directed perpendicular to the direction of the electric field; directed along the direction of the electric field; directed opposite the direction of the electric field; (The directions of the electric field and of the drift velocity have no direct relationship.)