Asmall metal sphere, carrying a net charge of q_1 = -2.80 mu c, is healed in a stationary position by insulating supports. a second small metal sphere, with a net charge of q_2 = -4.00 mu c and mass 1.30 g, is projected toward q_1. when the two spheres are 0.800 m apart, q_2 is moving toward zz with speed 22.0 m/s (see figure below). assume that the two spheres can be treated as point charges. you can ignore the force of gravity. what is the speed of q_2 when the spheres are 0.400 m apart how close does get q_2

The atoms in a sidewalk on a hot summer day are vibrating the atoms in the sidewalk on a freezing day in winter. a. more rapidly than b. more slowly than c. at the same speed as

Suppose that an electromagnetic wave which is linearly polarized along the x−axis is propagating in vacuum along the z−axis. the wave is incident on a conductor which is placed at z > 0 region of the space. the conductor has conductivity σ, magnetic permeability µ and electric permittivity ε. (a) find the characteristic time for the free charge density which dissipates at the conductor. (b) write the maxwell equations and derive the wave equation for a plane wave propagating in a conductor. (c) find the attenuation distance at which the incident amplitude reduces to e ^−1 of its initial value. (d) find the electric and magnetic fields inside the conductor. 8 (e) find the power loss per area of the incident electromagnetic wave at the surface of conductor.

An initially unpolarized light if intensity 500 w/m^2 passes through four polarizers. the transmission axis between adjacent polarizers is 45∘. what percentage of the initial intensity is transmitted by the system?