Light from a laser strikes a diffraction grating that has 5 304 grooves per centimeter. The central and first-order principal maxima are separated by 0.488 m on a wall 1.82 m from the grating. Determine the wavelength of the laser light. (In this problem, assume that the light is incident normally on the gratings.)

since you're a real machine, your ama is always less than your ima, because you can never totally eliminate friction.

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.