Aphysics student is presenting a report on a material that can conduct an electrical current with no resistance. she explains that the uses of this material are limited since the material has to be very cold when used. which best describes what the student’s report was about?
(a) superconductivity.
(b) solid-state physics.
(c) metallurgy.
(d) crystallography

The membrane surrounding a living cell consists of an inner and an outer wall that are separated by a small space. assume that the membrane acts like a parallel plate capacitor in which the effective charge density on the inner and outer walls has a magnitude of 7.0 × 10-6 c/m2. (a) what is the magnitude of the electric field within the cell membrane? (b) find the magnitude of the electric force that would be exerted on a potassium ion (k+; charge = +e) placed inside the membrane.

Name the non metal condut electricity

A10-kg isto a of 10 m at aa0.9 kg/m.30 kg of ,at aas10-m .. ( 9.8 m/s2 g.)