A single resistor is connected across the terminals of a battery. Which one or more of the following changes in voltage and current leaves unchanged the electric power dissipated in the resistor? Explain .A) Doubling the voltage and reducing the current by a factor of two. B) Doubling the voltage and increasing the resistance by a factor of four. C) Doubling the current and reducing the resistance by a factor of four. a) A, B,C will leave the power unchanged b) A, B will leave the power unchangedc) B, C will leave the power unchangedd) only A will leave the power unchanged e) only B will leave the power unchanged

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.

Hydrogen and helium are both members of?

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