What type of magnet is made use of to produce large force through a relatively small distance?

flat-faced plunger type and horse shoe type

What type of magnet is made use of to produce large force through a re

1.	What type of magnet is made use of to produce large force through a relatively small distance?
A.	flat-faced armature type
B.	horse shoe type
C.	flat-faced plunger type
D.	flat-faced plunger type and horse shoe type
Answer» B. horse shoe type