Discuss the difference between conductors and insulators. Give an example of a material that acts as a conductor and a material that acts as an insulator
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A: Im conduction there is a heat ene6 transfer by the molecules of the medium it self.
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Q: Insulators also contain electrons, but they are not conductors, Why?
A: Insulators consist of atoms having tightly bound electrons. Whereas, conductors have free electrons.
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Q: 9) Which of the following statements is correct? A) The increase in electrical conductivity of a…
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Q: The molar conductivity of Na1 ions in aqueous solution at 25°C has been determined to be =.01 × 10-2…
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Q: What would most likely to be an insulator? sodium germanium silicon aluminum glass
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- A close analogy exists between the flow of energy by heat because of a temperature difference (see Section 19.6) and the flow of electric charge because of a potential difference. In a metal, energy dQ and electrical charge dq are both transported by free electrons. Consequently, a good electrical conductor is usually a good thermal conductor as well. Consider a thin conducting slab of thickness dx, area A, and electrical conductivity , with a potential difference dV between opposite faces. (a) Show that the current I = dq/dt is given by the equation on the left: ChargeconductionThermalconductiondqdt=A|dVdx|dQdt=kA|dTdx| In the analogous thermal conduction equation on the right (Eq. 19.17), the rate dQ/dt of energy flow by heat (in SI units of joules per second) is due to a temperature gradient dT/dx in a material of thermal conductivity k. (b) State analogous rules relating the direction of the electric current to the change in potential and relating the direction of energy flow to the change in temperature.What is a characteristic that is common to a steel sheet, copper wire. metal paper clip and a wooden spoon does not have? * O all are conductors and allow electrons to flow except for the wooden spoon O all are insulators and allow protons to flow except the wooden spoon O all are insulators and allow electrons to flow except for the wooden spoon O all are conductors and allow protons to flow except for the wooden spoon.A close analogy exists between the flow of energy by heat because of a temperature difference (see Section 19.6) and the flow of electric charge because of a potential difference. In a metal, energy dQ and electrical charge dq are both transported by free electrons. Consequently, a good electri- cal conductor is usually a good thermal conductor as well. Consider a thin conducting slab of thickness dx, area A, and electrical conductivity ơ, with a potential difference dV between opposite faces. (a) Show that the current I = dq/dt is given by the equation on the left: Charge conduction Thermal conduction dq = oA dt dT kA dt dQ AP dx dx In the analogous thermal conduction equation on the right (Eq. 19.17), the rate dQ/dt of energy flow by heat (in SI units of joules per second) is due to a temperature gradient dT/dx in a material of thermal conductivity k. (b) State anal- ogous rules relating the direction of the electric current to the change in potential and relating the direction of…
- Two new materials have been discovered. One is shinyand has a metallic look, while the other is dull andhas a non-metallic look. Although you think that oneis a conductor and the other an insulator, you wantto be certain. Describe a test you could do to test theconductivity of these two materials.A close analogy exists between the flow of energy by heat because of a temperature difference (see Section 19.6) and the flow of electric charge because of a potential difference. In a metal, energy dQ and electrical charge dq are both transported by free electrons. Consequently, a good electrical conductor is usually a good thermal conductor as well. Consider a thin conducting slab of thickness dx, area A, and electrical conductivity o, with a potential difference dVbetween opposite faces. (a) Show that the current I= dq| dt is given by the equation on the left: Charge conduction Thermal conduction da = GA dt dQ = kA dx dt dx In the analogous thermal conduction equation on the right (Eq. 19.17), the rate dQ/ dt of energy flow by heat (in SI units of joules per second) is due to a temperature gradient dT/ dx in a material of thermal conductivity k. (b) State analogous rules relating the direction of the electric current to the change in potential and relating the direction of energy…A close analogy exists between the flow of energy by heat because of a temperature difference (see Section 20.7) and the flow of electric charge because of a potential difference. In a metal, energy dQ and electrical charge dq are both transported by free electrons. Consequently, a good electrical conductor is usually a good thermal conductor as well. Consider a thin conducting slab of thickness dx, area A, and electrical conductivity o, with a potential difference dv between opposite faces. (a) Show that the current I = dq/dt is given by the equation on the left: Charge conduction Thermal conduction dq TA dt JdT| kA dt dQ | dx |AP| |dx In the analogous thermal conduction equation on the right (Eq. 20.15), the rate dQ/dt of energy flow by heat (in Sl units of joules per second) is due to a temperature gradient dT/dx in a material of thermal conductivity k. (b) State analogous rules relating the direction of the electric current to the change in potential and relating the direction of…
- The molar conductivity of Na1 ions in aqueous solution at 25°C has been determined to be =.01 × 10-2 (V cm)-1 mol-1L. Assume an electric field of 1.0 × 102 V cm-1 is applied to the solution. Calculate the mobility and the drift velocity of Na1 ions.A block in the shape of a rectangular solid has a cross-sectional area of 4.00 cm^2 across its width, a front-to-rear length of 5.00 cm, and a material conductivity of 10^6 Ω x m^-1. The block’s material contains 5.00x10^22 conduction electrons/m^3. A potential difference of 35.0 V is maintained between its front and rear faces. Find: (a) the resistivity of the block material(b) the resistance of the block(c) the current through the block(d) the magnitude of the current density if it is uniform(e) the drift velocity of the conduction electrons (f) the magnitude of the electric field through the blockA wire with a radius of 7.72mm is made of a conducting material that has an atomic mass of 49.4 grams/mole and a mass density of 7.78x10³ kg/m³. You can assume that each atom of the material has one free electron associated with it. What is the drift velocity in a 17.6 cm long section of wire that is carrying 704 Amps? Assume 3 significant digits and units of mm/s. Watch out for units!
- A wire with a radius of 2.22mm is made of a conducting material that has an atomic mass of 72.0 grams/mole and a mass density of 6.17x103 kg/m3. You can assume that each atom of the material has one free electron associated with it. What is the drift speed vd in a 19.3 cm long section of wire that is carrying 664 Amps? Assume 3 significant digits and units of mm/s.A CONDUCTING WIRE OF CROSS-SECTION 0.1 MM^2 CARRIES A CURRENT OF 5A PRODUCED BY AN ELECTRIC FIELD AT 100 V/M.THE CONDUCTIVITY OF THE MATERIAL IsConsider electrons flowing in copper. a) Compute the average time between collisions for free electrons in copper. (Hint: The density of free electrons in copper is 8.44 x 1028 electrons / m3). b) Due to quantum mechanical effects, electrons in copper have a speed of about 106 m/s at room temperature. Show that electrons moving at such speeds will travel an average distance of 25 nanometers between collisions.