This paper deals with electromagnetic actions that allow one to control the
shaped-charge effect at different stages of shaped-charge operation. A dec
rease in penetration of the shaped-charge jet is attained by passage of a p
owerful electric current pulse through it, production of an axial magnetic
field in the shaped-charge liner immediately before shot, and production of
a magnetic field in the conducting target material that is transverse to t
he direction of jet propagation. The action on a jet by low-frequency and h
igh-frequency longitudinal magnetic fields and "mild" current action are di
rected toward increasing the penetration capability of a. shaped-charge jet
by increasing its ultimate elongation. Results of experimental and theoret
ical studies of different versions of electromagnetic actions are analyzed,
and the associated physical effects are considered.