Question Id: PH0000008
Question: Explain the meaning of the statement ‘electric charge of a body is quantised'.
Answer: Charge( may be positive or negative) of any body is integral multiple of electronic charge. This phenomena is quantisation of charge. If a body has \(Q\) amount of charge then it can be say from the quantisation of charge that \(Q=\pm ne\) where \(e\) is electronic charge [ \(e=-1.6 \times 10^{-19}C\) ] and \(n=1,2,3,4,......\)
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| Fig-1: Quantisation of charge |
Explanation:
A body get charged in two way
- By losing some electron
- By gaining some electrons
An atom has equal number of proton and electron due to ths fact in general an atom is neutral but when a body lose some electron then it become positively charged in this case number of proton is more in the atom and when gain some electron it become negatively charged as in this case number of electron is more in the atom. As fraction number of electron can not be transferred (lose or gain) so it means a body can get charge like multiple of electronic charge.
Example: Let a body get 5 number of electron then charge of the body is
\[Q=5e\]
\[\Rightarrow Q=5 \times (-1.6 \times 10^{-19}) C\]
\[\Rightarrow Q=- 8 \times 10^{-19} C\]
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N.B: Proton stay inside the neucleus so it is not an easy task to detached proton from neucleus due to heavy binding energy of neucleons ( proton and neutron ). If the number of proton increase or decrease the property of the atom changed e.g if proton number is 1 then the atom is Hydrogen(H) but if proton number is 2 then the atom is helium(He) etc.
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⭐ Related question answer from Reading tab:
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