  In the Wick-Cutkosky model we analyze nonperturbatively, in light-front
dynamics, the contributions of two-body and higher Fock sectors to the total
norm and electromagnetic form factor. It turns out that two- and three-body
sectors always dominate. For maximal value of coupling constant $\alpha=2\pi$,
corresponding to zero bound state mass M=0, they contribute 90% to the norm.
With decrease of $\alpha$ the two-body contribution increases up to 100%. The
form factor asymptotic is always determined by two-body sector.
