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When a plastic comb rubbed on hair is br...

When a plastic comb rubbed on hair is brought near bits of paper, it attracts them because

A

the comb and the paper get similarly charged

B

they get oppositely charged

C

the paper bits are very light

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
B
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When a comb is rubbed on dry hair and then brought close to small bits of paper, it attracts the bits of paper towards itself. Explain why?

When a charged comb is brought near a small piece of paper, it attracts the piece. Does the paper, it attracts the piece. Does the paper become charged when the conb is brought near it ?

Knowledge Check

  • When a charged rod is brought near small bits of paper, the small bits will

    A
    Be repelled by the rod
    B
    Stick firmly to the rod
    C
    Attach itself to the rod at first and then fly off
    D
    Remain unaffected.

  • When you rub the back of a plastic pen in your hair and bring it near a small piece of paper it attracts paper due to _______

    A
    electrostatic force
    B
    friction
    C
    magnetic force
    D
    gravity

  • When a plastic rod rubbed with wool is brought near the knob of a negatively charged gold leaf electroscope, the gold leaves

    A
    Contract
    B
    Dilate
    C
    Start oscillating
    D
    Collapse completely

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    Explore conceptually related problems

    Akshay and Sauranh are the students of class IX. They have recently studied the chapter on structure of atom in the class. Both Akshy and Saurabh were performing some activities in the science laboratory. Akshy took a plastic comb and rubbed it in his dry hair. When he brought this plastic comb (rubbed in dry hair) near tiny pieces of paper, the comb attracted the pieces of paper towards it. Mean while, Saurabh took a glass rod and rubbed it with a piece of silk cloth. When he brought this glass rod (rubbed with silk cloth) near the tiny pieces of paper, the glass rod also attracted the pieces of paper towards it (just like the plastic comb). Akshy and Saurabh had studied an instrument called electroscope in class VIII. So, they decided to make use of a positively charged electroscope having diverged leaves (or opened up leaves) in their activity. Akshy took the plastic comb (rubbed in dry hair) and touched the metal top of positively charged electroscope with it. This made the diverged leaves of electroscope to fold up. Saurabh then tool the glass rod (rubbed with silk cloth) and touched the metal top of another positively charged electroscope with it. This made the diverged leaves of the electroscope to diverge (or open up) even more. Askshy did not understand the various conclusions which could be drawn from all these observations. Saurabh explained him everthing very clearly. (a) What conclusion can be drawn from the observation that a plastic comb rubbed in dry hair and a glass rod rubbed with silk cloth, both attract tiny pieces of paper ? (b) What do the above observations tell us about the atoms present on plastic comb and glass rod ? (c) (i) What conclusion do you get from the observation that when a plastic comb rubbed in dry hair is touched with the metal top of a positively charged electroscope, then its diverged leaves fold up ? (ii) What conclusion do you get form the observation that when a glass rod rubbed with silk cloth is touched with the metal top of a positvely charged electrosope, then its leaves diverage even more ? (d) What are the two types of electric charges present in atoms as shown by the above observations ? Name the subatomic particles which carry these charges. (e) (i) Which electric charges are agained by a plastic comb on rubbing in dry hair ? (ii) Which electric charge are lost by a glass rod on rubbing with silk cloth ? (f) What values are displayed by Saurabh in this episode ?

    Why does a plastic comb rubbed with dry hair attaract tiny pieces of paper ?

    Explain why a comb rubbed on dry hair can attract small bits of paper.

    When a plastic pen is rubbed in dry hair, it attracts tiny pieces of paper. Which force is involved in this process ?

    When you rub the back of a plactic pen in in your hair and bring it near a small piece of paper it attracts paper due to -------- .

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