Two identically sized metal spheres are on insulating stands. The charge on sphere A is -4.0*10-6 coulombs and the charge on sphere B is -8.0*10-6 coulomb. What is the charge on Sphere B after they touch and separate? What is total number of excess electrons on Sphere A after they separate?

Which units can be used to measure length or distance? check all that apply. gram meter kilometer liter inch

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.

Which law represents the thermodynamic statement of the conservation of energy of a system? a. the fourth law b. the first law c. the second law d. the third law