is there any medium having value of dielectric constant less than that of vacuum ?
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according to books, there is NO any medium having dielectric constant is less than that of vacuum.
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If a material had a relative permittivity less than 1 the charge stored would be less than with air/vacuum. ... it would require an external energy source to 'force' it's mobile charges or polar molecules to do this. For this reason there isn't a material that inherently has a relative permittivity that is less than 1.O
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