Question

what is the number of electric lines of force that radiate outwards from one coulomb of charge in vacuum??​

Answer 1

Hi there :)

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>Number of field lines is proportional the flux emanating from a charge source in unit area;

>Flux is given by: [Ф = E x A  = q /ε ]

q= net charge for which flux is calculated

ε= permittivity of free space

E = electric field intensity

A = area

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Now, in the given question q = 1C and ε(in vaccum) = 10^{-9} / (4π x 9)

so

Ф = 9 x 10^{9} / (4π)

    ≈ 3/4 x 10^{9}

   ≅ 7.5 x 10^{9}  [ ans.]