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Grade 12General Physics

what is mean by electric constant?
electric constant=1/(magnetic constant * speed of light)

please explain this equation.

Profile image of nitin singh
15 Years agoGrade 12
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2 Answers

Profile image of Rathod Shankar AskiitiansExpert-IITB
ApprovedApproved Tutor Answer15 Years ago

The electric constant(ε0) is a constant.

it appears Coulomb's law can be given as:

F = \frac{1}{4 \pi \varepsilon_0} \ \frac{|q| |Q|}{r^2}

\varepsilon_0 = \frac{1}{\mu_0 c^2}

here μ0 = 4π × 10−7 N/A2

\varepsilon_0 = \frac{10^7}{4\pi\,c^2} = 8.854\;187\;817... 10^{-12}
ε0=The permittivity of empty space
   = equal to 1 in centimeter-gram-second electrostatic units and to 107/4πc2 farads permeter         = 8.854 × 10-12 farad per meter 


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Profile image of harini desiraju
15 Years ago

the terms electric constant and magnetic constant are introduced while defining coloumb's inverse square law.These are used as proportionality constants in the fields of electricity and magnetism respectively.I am not aware of the derivation,but can tell u the relation between 'c' and these constants. light is an electromagnetic wave.So,its speed should describe the nature of both electric and magnetic waves. Thus we can accept this relation.(c2=1/electric const. * magnetic const.)

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