Air core solenoid, coils wound on a plastic tube with approximately 575 turns of copper wire, can carry a current of 5A continuously or 10A intermittently.
Torsion of Metal Rods Apparatus, Searles, Horizontal pattern, having heavy metal pulley, two heavy metal brackets and two graduated scales are mounted on the connecting rod & two pointer can be clamped on the test rod with one brass & one steel test rod