Asubstance with a ph of 13.0 will a. change red litmus paper to blue. b. change blue litmus paper to red. c. not change red or blue litmus paper. d. not be testable using litmus paper.

are there answer choices to this question? this seems like a question where you have options to choose from.

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.