In an isolted, charged, parllel-plate air capacitor, the charge per unit area on each plate has a magnitude of `sigma`. A dielectric slab having the dielectric constant K is now introduced between the plates. The induced charge per unit area on the surface of the dielectric will have magnitude.
A. `(sigma)/(K)`
B. `sigma(K-1)`
C. `sigma(1-(1)/(K))`
D. `(sigma)/(K+1)`
