The phase angle of a sinusoidal source determines the value of the source at t=0. A sinusoidal source described by the function cos(ωt+ϕ) has a phase angle of ϕ. By convention, the phase angle’s units are usually specified in degrees, because those units are easier to visualize than the units of radians. Changing the phase angle of a sinusoid shifts it left or right along the time axis but has no effect on the magnitude or frequency of the sinusoid. What is the phase angle of the voltage source described as?

e

explanation:

there is no change in the electric potential energy as it is in rest on both conditions.

i just did an experiment like this in my science class. also the answer is yes, it will get separated because they are two opposites meaning if they are opposite they can not attract.

hope this .!

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle  

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.