A cylindrical wire has cross-sectional area A and number density of free electrons n. The wire has current I and the free electrons have average drift speed v. A second cylindrical wire has cross-sectional area 0.5A and number density of free electrons 2n. In this wire, the free electrons have average drift speed 2v. What is the current in the second wire?

A wire of cross-sectional area 5.0 × 10⁻⁶ m² is made of a metal of resistivity 50 × 10⁻⁸ Ω m. The potential differenc…

Electrons move in a vacuum from one metal plate to another metal plate. As a result of this, there is an electric cur…

A manufacturer recommends that the longer the extension cord you use with an electric drill, the bigger the cross-sec…

Electromagnetic waves from an unknown source in space were found to be significantly diffracted when passing through …

Using monochromatic light, interference fringes are produced on a screen placed a distance D from a pair of slits of …

Which row describes the circumstances under which forces act on a charged particle in a uniform electric field?