To charge an object by contact. :
Rub a plastic comb against paper. Touch this comb with another unchagred comb. Take the other comb near some pieces of paper. What happens?

To charge an object by induction. : Rub a comb or a balloon on your hair. As shown in the picture 8.4 on page 54 of your textbook, take the comb near a thin trickle of water from a tap what happes. Now draw the comb away from the trcikle and observe what happens. : Mark your observation with a tick. : When the charged comb is brought close to the flowing water, water gets attracted/repelled/remains as it was. : when the charged comb is taken away from the flowing water, it gets attracted.repelled/remains as it was initially.

Rub one end of a glass rod against a silk cloth. Due to the rubbing a small charge will get transferred from one object to the other. As a result both the objects will become somewhat charged. Suspend this rod freely in air with the help of a thread. Now charge another glass rod in the same manner and bring it near the suspended tod. What do you see?

Answer the following question : In the following example, state whether the force is a contact force or non contact force : when a comb is rubbed against hair, small pieces of paper kept on a table get attracted to the comb.

Do you have experience of the instances given below? : A plastic comb or ruler rubbed on dry hair attracts pieces of paper. : If we pass near a polyester curtain again and again, it gets attracted towards us. : If we rub a blanket with our hands and take it near a metal object, a spark is seen in the dark. : What is the cause of these effects?

Do you have experience of the instances given below? : A plastic comb or ruler rubbed on dry hair attracts pieces of paper. : If we pass near a polyester curtain again and again, it gets attracted towards us. : If we rub a blanket with our hands and take it near a metal object, a spark is seen in the dark. : What do the above observations tell us?

Fill in the blanks : Negatively charged particles which get transferred from one object to another when rubbed against each other are ………..

Now take plastic rod. Rub one of its ends against a woollen cloth. Bring that end near the suspended glass rod. Now what do you see?