Tag: electric charges and fields
Questions Related to electric charges and fields
What causes electrification of two bodies when they are rubbed together ?
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Transfer of atoms from one body to the other body.
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Transfer of electricity from one body to the other body.
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Transfer of electrons from one body to the other body.
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Transfer of heat from one body to the other body.
Electrification is defined as the transfer of electrons from one body to another when they are rubbed with each other.
Negative electrification is due to the excess of electrons (compared to the normal number of electrons in a neutral atom).
For example, on rubbing a glass rod with silk, the electrons from the glass rod get transferred to the silk. The silk now has an excess of electrons and so is negatively-charged. On the other hand, the glass rod is deficient in electrons and hence is positively-charged.
In the above example, the silk undergoes negative electrification.
Positive electrification is due to the deficiency of electrons (compared to the normal number of electrons in a neutral atom).
For example, on rubbing an ebonite rod with fur or cat's skin, the electrons from the cat's skin get transferred to the ebonite rod. The cat's skin now has a deficiency of electrons and so is positively-charged. On the other hand, the ebonite rod has an excess of electrons and hence is negatively-charged. In the above example, the cat's skin undergoes positive electrification. It should be noted that it is the electrons and not the protons that get transferred during positive (and negative) electrification.
A neutral rubber rod and a neutral piece of fur have equal amounts of negative and positive charge. When the fur is rubbed against the rod, a transfer of electrons occurs. The transfer of electrons and mass transfer respectively takes place from
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fur to rubber rod; rubber rod to fur
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fur to rubber rod; fur to rubber rod
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rubber rod to fur; rubber rod to fur
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rubber rod to fur; fur to rubber rod
Answer is B.
On rubbing an rubber rod with fur, the electrons from the fur get transferred to the rubber rod. The fur now has a deficiency of electrons and so is positively-charged. On the other hand, the rubber rod has an excess of electrons and hence is negatively-charged.
In the above example, the fur undergoes positive electrification. It is to be noted that it is the electrons and not the protons that get transferred during positive (and negative) electrification.
Here, the transfer of electrons and mass transfer respectively takes place from fur to the rubber rod.
When a glass rod is rubbed with a piece of silk cloth the rod
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and the cloth both acquire positive charge
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becomes positively charged while the cloth has a negative charge
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and the cloth both acquire negative charge
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becomes negatively charged while the cloth has a positive charge
Answer is B.
Negative electrification is due to the excess of electrons (compared to the normal number of electrons in a neutral atom).For example, on rubbing a glass rod with silk, the electrons from the glass rod get transferred to the silk. The silk now has an excess of electrons and so is negatively-charged. On the other hand, the glass rod is deficient in electrons and hence is positively-charged.
In the above example, the silk undergoes negative electrification.
Hence, the glass rod becomes positively charged while the silk cloth has a negative charge.
When a glass rod is rubbed with silk
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Negative charge is produced on silk but not charge on the glass rod
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Equal but opposite charge are produced on the both
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Equal and similar charges are produced on the both
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Positive charge is produced on the glass rod but no charge on the silk
When glass rod is rubbed with silk, glass happens to lose electrons easily and silk grabs them away from the glass atoms. So after rubbing, the glass becomes positively charged and the silk becomes negatively charged.
A hollow metallic sphere is charged. Inside the sphere
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The potential is zero but the electric field is finite
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The electric field is zero but the potential is finite
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Both the electric field and the potential are finite
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Both the electric field and the potential are zero
When a glass rod is rubbed with silk, it is said to be positively charged. Which of the following statement is true?
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Electrons move from silk to glass
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Electrons move from glass to silk
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Protons move from silk to glass
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Protons move from glass to silk
When a glass rod is rubbed with silk, it acquires a positive charge, means it is deficit of electrons i.e, electrons move from glass to silk. So glass rod becomes positively charged and silk rod is negatively charged.
Two uncharged bodies when rubbed against each other get charged. This is known as
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Charging by conduction
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Charging by friction
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Charging by induction
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Charging by convection
Charging by friction refers to generation of charge on uncharged bodies when rubbed against each other. One of the rubbed material loses electrons and becomes positively charged and other material gains that electron and becomes negatively charged.
When a plastic comb rubbed on hair is brought near bits of paper, it attracts them because:
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The comb and the paper get similarly charged.
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They get oppositely charged.
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The paper bits are very light.
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None of these
A comb rubbed on hair gets electrically charged. It attracts small bits of paper because opposite charges attract. So, comb and bits of paper are oppositely charged.
If a body is charged by rubbing it, its weight _________.
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Remains precisely constant
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Increases slightly
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Decreases slightly
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May increase or decrease slightly
If a body is charged by rubbing it, then it may lose or gain electrons. Since electrons have a mass of $(9.1\times 10^{-31} :Kg)$. So, a slight weight may increase or decrease slightly.
The process suitable for charging a glass rod is :
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conduction
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induction
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rubbing against a suitable substance
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all of the above
The process suitable for charging a glass rod is by friction,means by rubbing against a suitable substance.