
Interpretation : The reason for liquids to not get repelled by charged wand is to be explained.
Concept Introduction :
There are two classes of molecules; polar and nonpolar. Polar molecules are attracted by a charged wand whereas a nonpolar molecule is not attracted by a charged wand. Examples of polar molecules are water, vinegar, and rubbing alcohol. Examples of nonpolar molecules are mineral oil, hexane, and motor oil.

Explanation of Solution
A polar molecule is one which has a partial positive charge on one side and partial negative charge on other side of the molecule.
A polar molecule gets attracted by a charged wand. A polar liquid has both positive and negative charges. If a negatively charged wand is brought near it, atoms with partial positive charges align towards the wand and the liquid is attracted to the wand. If a positively charged wand is brought near a polar liquid, atoms with partial negative charges align towards the wand and the liquid again gets attracted to the wand. In either case a polar liquid always gets attracted by a charged wand.
A nonpolar liquid does not get attracted by a charged wand even if the charges are reversed. The liquid does not get repelled also because there are no partial charges on the atoms in case of a non-polar liquid.
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