What type of object acquires negative charge and what type of object acquires a positive charge? For example, when a plastic straw is rubbed with a polythene, how would I know that the plastic straw would carry a negative charge?

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Solution

When you rubbed the plastic straw then its electron comes on its surface ,so it become negatively charged.

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Q. A glass rod and a plastic straw, both are rubbed with a polythene sheet and brought to each other. Attraction is observed. What kind of charge is acquired on the plastic straw?

Q. When a plastic refill is rubbed with polythene, which object acquires an electric charge?

When a charged glass rod rubbed with silk is brought near a charged plastic straw rubbed with polythene, there is an attraction between the two. Identify the charge on the plastic straw.

A glass rod is rubbed with a silk cloth and an inflated rubber balloon is rubbed with a woollen cloth.

Now, out of glass rod, silk cloth, rubber balloon and woollen cloth:

(a) Which two objects acquire negative charge?

(b) Which two objects acquire positive charge?

Choose the correct option:

Statement 1: When a plastic straw is rubbed with a piece of paper and brought near another plastic straw, it attracts the second straw.

Statement 2: A straw is said to have acquired electrostatic charge after it has been rubbed with a piece of paper. Therefore, it exerts an electrostatic force on the second straw and attracts it.

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