What is "to arm a magnet"

Arm \Arm\, v. t. [imp. & p. p. Armed; p. pr. & vb. n. Arming.] [OE. armen, F. armer, fr. L. armare, fr. arma, pl., arms. See arms.]

1. To take by the arm; to take up in one's arms. [Obs.]

   And make him with our pikes and partisans A grave: come, arm him.
   --Shak.

   Arm your prize; I know you will not lose him.
   --Two N. Kins.

2. To furnish with arms or limbs. [R.]

   His shoulders broad and strong, Armed long and round.
   --Beau. & Fl.

3. To furnish or equip with weapons of offense or defense; as, to arm soldiers; to arm the country.

   Abram . . . armed his trained servants.
   --Gen. xiv. 1

4. 4. To cover or furnish with a plate, or with whatever will add strength, force, security, or efficiency; as, to arm the hit of a sword; to arm a hook in angling.

5. Fig.: To furnish with means of defense; to prepare for resistance; to fortify, in a moral sense.

   Arm yourselves . . . with the same mind.
   --1 Pet. iv. 1.

   To arm a magnet, to fit it with an armature.