4.A force of 4Nis acting between two charges in air.If the space between them is completely filled with glass (relativity permitivity=8) then the new force will be -----------

If space is filled with glass, the force changes because force in medium is 1/K times the force in vacuum/air.
The new force will be given by,F=1kFair=18×4=0.5 N

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Fnew = Fold / Dielectric constant  = 4/8 = 0.5 N . Hope that helps.
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