Please select that whether below statements are correct or not?
1. Resistivity is the property...
Please select that whether below statements are correct or not?
1. Resistivity is the property that measures a material's ability to provide "obstacles" to the flow of electrons caused by an external electric field. Such a flow of electrons is called an electric current. Resistivity rho is defined as the ratio of the magnitude of the electric field E to the magnitude of the current density J: rho=EJ.
2. Resistance is a measure of an object's ability to provide "obstacles" to electric current. The resistance R of a conductor (often, a metal wire of some sort) is defined as the ratio of the voltage V between the ends of the wire to the current I through the wire: R=VI.
3. Ohm's law is not a fundamental law of physics; it is valid under certain conditions (mostly, metal conductors in a narrow range of temperatures). Still, Ohm's law is a very useful tool, since many circuits operate under these conditions.
Answers: 1
Physics, 22.06.2019 03:00
If it takes a planet 2.8 x 10^8 s to orbit a star with a mass of 6.2 x 10^30 kg what is the average distance between the planet and the star
Answers: 3
Physics, 22.06.2019 04:00
Which configuration would produce an electric current? a) rotate a coil of copper wire between two magnets. b) connect a wire between a copper and zinc strip sitting in a beaker of water. c) connect a wire to the (+) positive end of a battery and the other end to a light bulb. d) connect a wire to the negative end of a battery and the other end to a light bulb.
Answers: 2
Physics, 22.06.2019 04:30
Asystem containing an ideal gas at a constant pressure of 1.22×10^5 pa gains 2140 j of heat. during the process, the internal energy of the system increases by 2320 j. what is the change in volume of the gas?
Answers: 3
Physics, 22.06.2019 07:20
Samir watches a 100-minute movie on his spaceship. maria's spaceshipe flies in the same direction as samir's spaceship but she observes his move to last 125 minutes and his spaceship to be 40 m long. how long does samir observe his own spaceship to be? according to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does marias voyage take according to samir?
Answers: 3
History, 22.04.2020 08:52
Physics, 22.04.2020 08:52
Mathematics, 22.04.2020 08:52
Chemistry, 22.04.2020 08:52
English, 22.04.2020 08:52