Will mark ! is string a ferromagnetic material?

See, the string is made of nickel and steel (iron+carbon), materials that are ferromagnetic. That is, a magnet attracts guitar strings. When this ferromagnetic metal vibrates in the magnetic field of the pickup, that disturbs the red field lines which also cross through the coil (not shown).

Explanation:

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this

i think the answer is a and b

i wish you luck