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PureVelocity
In the covalent bond between oxygen and hydrogen, the oxygen atom attracts electrons a bit more strongly than the hydrogen atoms. The unequal sharing of electrons gives the water molecule a slight negative charge near its oxygen atom and a slight positive charge near its hydrogen atoms.
I think its because  the molecule is V shaped and the lone pairs  on the oxygen atom  strongly attract the electron on the hydrogen atoms producing a partial positive charge formed on each H atom.

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