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During dry weather, while combing hair, sometimes we experience hair flying apart. The force responsible for this is

A. force of gravity

B. electrostatic force

C. force of friction

D. magnetic force

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The correct option is B.

When two objects are rubbed together, there is exchange of electrons. 

During dry weather, the hair follicles are straightened up and they have picked up electrons during the rubbing process. The follicles have the like charges that repel each each other.

The force responsible for this is the electrostatic force electrostatic force.

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