Four point charges, q, are fixed to the four corners of a square that is 12.6 cm on a side. An electron is suspended above a point at which its weight is balanced by the electrostatic force due to the four point charges, at a distance of 12 nm above the center of the square. (The square is horizontally flat, and the electron is suspended 12 nm vertically above the center of the square.) What is the magnitude of each fixed charge in coulombs?

How can you measure the amplitude of a longitudinal wave?

What is the quantity which is measured by the area occupied below the velocity- time graph?

Abox that has self-contained cable clamps holds two light switches. a two-wire no. 12 cable with ground feeds the box, and a pair of two-wire no. 12 cables (four conductors) with ground wires leaves the box to feed the light fixtures. the second switch is fed by a no. 12 jumper wire from the first switch. which one of the following box combinations would furnish the minimum allowable volume? a. two 3-inch × 2-inch × 21⁄2-inch gangable device boxes b. two 3-inch × 2-inch × 11⁄2-inch gangable device boxes c. two 3-inch × 2-inch × 23⁄4-inch gangable device boxes d. two 3-inch × 2-inch × 21⁄4-inch gangable device boxes