Q K A Square parallel plate capacitor with side length l= 50cm and thickness d = 1mm, has charge Q = 12µC shown in the figure . The capacitor is separated from the battery. The insulator with...

Extracted text: Q K A Square parallel plate capacitor with side length l= 50cm and thickness d = 1mm, has charge Q = 12µC shown in the figure . The capacitor is separated from the battery. The insulator with dielectric constant K = 6 pulled out in the +x direction by the applied external force of F. Find the expression of the force F as a function of x for the interval 0< l.="" ɛ,="" ignored)="" 9x10-12()="" (all="" frictions="" are="" nm2="" а)="" f%3d="" (3="" —="" 20х)-2="" (n)="" b)="" f="9(10" –="" 40x)-²="" (n)="" c)="" f="2(12" –="" 30x)-2="" (n)="" d)="" f="8(30" –="" 40x)-2="" (n)="" e)="" f="18(21" –="" 60x)-²="">