What does it mean to
"accelerate"?

increase in amount or extent.

Explanation:

in other words speed up or go faster in a less time period

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.

a electromagnetic waves