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two point charges are kept separated by 4 cm of air and 6cm of a dielectric of relative permittivity 4. the equivalent dielectric separation between them so far their coulombian interaction is concerned isa) 10cm  b) 8 cm  c) 5cm d) 16cm

Arun Kumar IIT Delhi
6 years ago
In a dielectric medium you can assume that the length in air is increased by
$\sqrt{\epsilon_r}$
$1/(4+\sqrt4*6)^=1/4*r^2\\=>r^2=16*16/4\\=>r=16/2=8cm$
Thanks & Regards
Arun Kumar
IIT Delhi