Scientists who consider how their research may affect the environment show a sense of

environmental control? environmental protect?

the answer is to check all of them! they all apply well at least i think so!

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.