a) Take two identical straws and suspend one piece freely. Rub the other straw with a piece of paper. Bring the rubbed end of the straw near the suspended one. What do you observe from this activity? Can you tell which type of force it is?
b) Comb your dry hair. Bring the comb to small pieces of paper. What do you observe? Explain.

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Solution

a) When the straw is rubbed by a piece of paper it acquires charge. When brought near the suspended straw, the suspended straw which was electrically neutral , derives an induced opposite charge on the surface and gets attracted by the charged end of the other straw and moves toward it. The force acting between these straws is the electrostatic force.

b) While combing, the comb acquires electrical charge due to charging by rubbing, When it is brought closer to small pieces of paper, the paper get attracted towards the electrically charged comb.

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