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Electric Field due to Polarisation

Sreeram asks:

“do charges produced due to polarization in a dielectric produce electric field outside?”

Ans:

When a dielectric is kept in an electric field, it is polarized. The polarized ends are just like the two plates of a parallel plate capacitor. The electric field is confined between the two surfaces (except for some edge effect). So, in a macroscopic point of view, the answer is no.

(However, I agree that there is scope for disagreement and debate when we think and look at the microscopic level. Users of the site are requested to post comments)

Why Water is transparent?

Sahurupika asks

“why [wiki]water [/wiki]has no colour?”

Ans:

Simple questions are always difficult to answer.

An object appear coloured or colourless depending on the colours of the spectrum absorbed, transmitted or reflected by it. We see an object in the colour we receive from it. Water allows all the colours to pass through them and therefore we see it as [wiki]transparent[/wiki].

(From another point of view “Water is one of the most essential substance for the existence of water. [wiki]Transparent [/wiki]and colourless appearance of water tels about its [wiki]purity[/wiki].”)

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