Astrip of copper 150 μm thickand 4.5 mm wide is placed in a uniform magnetic field b (vector) ofmagnitude 0.65 t, with b (vector) perpendicular to the strip. acurrent i=23 a is then sent through the strip such that ahall potential difference v appears across the widthof the strip. calculate v. (the number of charge carriersper unit volume for copper is 8.47 x 1028electrons/m3.)

i used v = bi / nle so v = (.65t*23a)/8.47e28*1.6e-19*150e-5m) = 7.35e-6v which is what the2nd response in the other thread used. and, according to thistextbook, it says "l" is the thickness of the strip however in theother thread, in the first response, they used v = e d where e =1.103e-9 and d = 4.5e-3 therefore the answer is 4.96 e-12

which is correct?

Debbie places two shopping carts in a cart corral she pushes the first cart which then pushes a second cart what force is being exerted

Some material consisting of a collection of microscopic objects is kept at a high temperature. a photon detector capable of detecting photon energies from infrared through ultraviolet observes photons emitted with energies of 0.3 ev, 0.5 ev, 0.8 ev, 2.0ev, 2.5ev, and 2.8ev. these are the only photon energies observed. (a) draw and label a possible energy-level diagram for one of the microscopic objects, which has four bound states. on the diagram, indicate the transitions corresponding to the emitted photons. explain briefly. (b) would a spring–mass model be a good model for these microscopic objects? why or why not? (c) the material is now cooled down to a very low temperature, and the photon detector stops detecting photon emissions. next, a beam of light with a continuous range of energies from infrared through ultraviolet shines on the material, and the photon detector observes the beam of light after it passes through the material. what photon energies in this beam of light are observed to be significantly reduced in intensity (“dark absorption lines”)? explain briefly.

Abicycle slows down when the rider applies the brakes. what type of energy transformation is involved in this example? a. kinetic energy into heat energy b. heat energy into potential energy c. potential energy into kinetic energy d. kinetic energy into mechanical energy