Theoretically, the lines of force emanating from a charge are infinite. Faraday suggested that the electric field should be assumed to be composed of very small bunches containing a fixed number of electric lines of force. Such a bunch or a closed area is called a tube of flux.
Note : The total number of lines of force or tubes of flux
in any particular electric field is called as the electric flux.
This is represented by the symbol Ψ. similar to charge, unit
of electric flux is also coulomb C.
One coulomb of electric flux is defined as that flux which
emanates from a positive charge of one coulomb.
In general, if the charge on a body is ±Q coulombs, then the
number of tubes of flux or total electric flux, starting or terminating on it
is also Q.
So, for a charge of ±Q coulombs,
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