If you push five times as hard against a non-moving wall, the amount of work you do A) remains constant but non-zero.
B) doubles.
C) quadruples.
D) is cut in half.
E) zero.

remains constant but non-zero

Explanation:

the force you apply will increase but in the question it stated a non-moving wall hence making it non- zero .

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.