write an activity to show that an electrically chared body is attracted by an uncharged body.
Answers
Explanation:
Yes.
There are two ways for body to be uncharged. One way is to have a fundamental particle with no charge, such as a photon. The second way is to have a body made up equal numbers of positive and negative charges, so the charges cancel out. These bodies will be attracted to a charge, but the force of attraction may be extremely weak.
The strongest attraction occurs if the uncharged body is made up of polar molecules that are free to move. The best example is water - In an H20 molecule, the oxygen atom is slightly negative and the hydrogen atoms are slightly positive.
If there is a charged body nearby - let’s say a positive charge for example - it will attract the more negative oxygen part of the H20 molecule and repel the more positive hydrogen part. As a result, the molecule will twist to align itself with charged body’s electric field (though that alignment is constantly getting jiggled by thermal motion).
With the polar molecules partly aligned in the uncharged body, the charged body can attract it. Try it yourself - Rub a balloon in your hair to put a charge on it, and hold the balloon near a gentle stream of water coming from the tap in your kitchen. The uncharged water will be attracted to the balloon:
There can still be an attraction even for substances made of molecules that are not polar. The electric field of the charged body can distort the electron orbitals in the uncharged body, making its molecules temporarily polar in the presence of the electric field, even though the molecular are not permanently polar. This is called an induced dipole - The electric field induces a separation of charge in the molecule, creating a temporary positive and negative poles, the dipole. But the force of attraction between a charged body and the induced dipoles in an uncharged body is typically a very small force.
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