Read the excerpt below from act 3.2 of The Tragedy of Julius Caesar and answer the question that follows. BRUTUS: . . . I say that Brutus’ love to Caesar was no less than his. If then that friend demand why Brutus rose against Caesar, this is my not that I loved Caesar less, but that I loved Rome more. . . . As Caesar loved me, I weep for him. As he was fortunate, I rejoice at it. As he was valiant, I honor him. But as he was ambitious, I slew him. There is tears for his love, joy for his fortune, honor for his valor, and death for his ambition. Who is here so base that would be a bondman? If any, speak, for him have I offended. Who is here so rude that would not be a Roman? If any, speak, for him have I offended. Who is here so vile that will not love his country? If any, speak, for him have I offended. I pause for a reply. Which statement summarizes the main idea of Brutus’ speech?

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.

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.