Ametal surface is illuminated by light with a wavelength of 450 nm . the maximum kinetic energy of the emitted electrons is found to be 1.20 ev .what is the maximum electron kinetic energy if the same metal is illuminated by light with a wavelength of 350 nm ?

what is the actual question though?

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.