[III] Two narrow slits are illuminated by monochromatic light. If the distance between the slits is 3.2 wavelengths, what is the maximum number of bright fringes that can be seen on a screen

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.